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Old 2005-04-26, 21:11
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A Math Problem...Part 2

A spin off of FBS's thread wanted to know who'd be able to solve this...

Let's say you invest $100 in an account that is continiously compounding its interest. The rate of increase is 6%. How much will be in your account after 1 year.

Half credit if you get how much will be in your account after a year of just compounding interest (not continuously).

 
Old 2005-04-26, 21:12
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Oh...Round to the nearest Cent mind you (and this is American Dollars...USD)
 
Old 2005-04-26, 21:13
BlackRoseImmortal
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I can get the compounding interest - ????. Maybe if I knew what continuously compounding was...

Last edited by BlackRoseImmortal : 2005-04-26 at 21:20.
 
Old 2005-04-26, 21:14
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Hah edit that answer out...so no one sees it...just PM me with your answer
 
Old 2005-04-26, 21:21
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It's simple maths.
 
Old 2005-04-26, 21:25
shimbolla
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A math problem? What the hell are you trying to do, cause all three of my brain cells to explode simultaneously?
 
Old 2005-04-26, 21:25
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Continuously compounding is similar to compounding, but its more like its growing every second or so instead of at one time. Continuously compounding will give you a larger number than just compounding and it varies directly with time (so it'll keep rising).
 
Old 2005-04-26, 22:52
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Am I allowed to answer this? Probably should not. Let's wait and see first, shall we?
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-26, 23:29
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Wore her out before I could finish(which im grateful for)


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Old 2005-04-27, 00:10
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Quote:
Originally Posted by far_beyond_sane
Am I allowed to answer this? Probably should not. Let's wait and see first, shall we?

Go for it...just don't post your answer
 
Old 2005-04-27, 00:36
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Quote:
Originally Posted by Kalmahswamp
Oh...Round to the nearest Cent mind you (and this is American Dollars...USD)

Why would what currency it is in matter?

I am too lazy to do it now, I may consider it tomorrow after I have finished some more important work, though If i remember rightly I will be endevouring to recall some year 9 maths. (Or year 11 maths for those who did the easy stuff)
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Old 2005-04-27, 04:15
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Quote:
Originally Posted by BlackRoseImmortal
It's simple maths.


Yes, it is. My problem was about 5 times harder. I would expect any high school student doing even remotely advanced maths to nail this.

KS, you got my solution - ain't it neat?
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-27, 06:56
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is it 6% Per Annum or 6% per day?
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omg t3h @x1s p3d@ls @r3 t3h b3st!!!!!!1!!11
 
Old 2005-04-27, 10:54
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i have no idea what continuously compounding is, er....106

n.b.
my answer makes me a moron.

[edit]
I got an E in maths by the way....
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Old 2005-04-27, 11:25
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I submitted an answer of sorts...

I have a beautiful maths problem which should be attempted next, I'll post it when this one is solved.
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-27, 11:37
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Quote:
Originally Posted by Amon rA
I have a beautiful maths problem which should be attempted next, I'll post it when this one is solved.


We're not going to put solutions here so it doesn't matter if it's solved or not. Post it now.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-27, 11:41
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Yeah, post it now. Or start a new thread if you wish.
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Old 2005-04-27, 11:55
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ok here it is

start with the algebraic equation

A = B

multiply each side by A
add (A^2 -2AB)
devide by (A^2 -AB)

and you should be left with an interesting answer... where did you go wrong?

A^2 denotes A to the power of 2, as always, pm me with your answer
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-27, 13:32
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Done. Easy. More.

Does anyone know the Monty Hall problem? That's a riot, that one. Can post if you'd like.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-27, 13:35
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ive had a couple of answers...
fay beyond sane is on the ball.
beats of carrion: do the last step again (the deviding) then study the answer
powersoft: try again, sit down with a pencil and a piece of paper
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-27, 13:36
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Quote:
Originally Posted by far_beyond_sane
Done. Easy. More.

Does anyone know the Monty Hall problem? That's a riot, that one. Can post if you'd like.

please
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-27, 14:08
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I may be wrong with the math, but you won't stop spelling divide wrong.
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This is my band's page
http://www.myspace.com/ferocitydentontx
 
Old 2005-04-27, 14:17
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First, another one that's easy to solve but harder to prove. Post the solution in the thread here, my inbox is clogged with too many PMs called "FuckING Math prob!!1"

"Listen here Son, do you know how old your grandfather is?"
"Absolutely, Dad. The silly old cunt's age is five times the sum of the digits of his age, plus one."
"Don't call your grandfather a cunt, you little bollocks. And remember, that's also true for you!"

How old are the son and the grandfather?

Monty Hall coming soon...
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-27, 14:38
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Quote:
Originally Posted by powersofterror
I may be wrong with the math, but you won't stop spelling divide wrong.

damn I didnt even notice I was . maybe i should ask for a spell-checker thing in feed back.

F.B.S:the grandson is half your age(assuming you haven't had your birthday already)
and his grandfather is 34 years your senior.
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"

Last edited by Amon rA : 2005-04-27 at 14:51.
 
Old 2005-04-27, 14:55
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Quote:
Originally Posted by Amon rA

F.B.S:the grandson is half your age(assuming you haven't had your birthday already)
and his grandfather is 34 years your senior.


Good call. Got proof?
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-04-27, 15:26
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Quote:
Originally Posted by powersofterror
I may be wrong with the math, but you won't stop spelling divide wrong.


offtopic...sorry

I'm perhaps the worst speller here...but I keep seeing about 8 diff people here (most very good with grammer) keep spelling genius as "genious"
 
Old 2005-04-27, 16:02
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Haha yeah, I used to spell it that way. Mainly because of words like "ingenious" and shit.
 
Old 2005-04-27, 19:06
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FBS was the only one to get my question right so far...although others are on the right track
 
Old 2005-04-27, 19:09
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Quote:
Originally Posted by far_beyond_sane
First, another one that's easy to solve but harder to prove. Post the solution in the thread here, my inbox is clogged with too many PMs called "FuckING Math prob!!1"

"Listen here Son, do you know how old your grandfather is?"
"Absolutely, Dad. The silly old cunt's age is five times the sum of the digits of his age, plus one."
"Don't call your grandfather a cunt, you little bollocks. And remember, that's also true for you!"

How old are the son and the grandfather?

Monty Hall coming soon...


Hah that question is worded so crazily I don't even know what to do

I have a pretty cool question having to do with Newton's Law of Cooling. Requires a lot of log work though so it can get tedious
 
Old 2005-04-27, 19:16
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For anyone stuck...its a "pert" problem: A=Pe^rt in which:

A= New amount
P= Principle deposit (100)
r= rate of interest (.06)
t= time (1)
 
Old 2005-04-28, 16:19
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Quote:
Originally Posted by far_beyond_sane
Good call. Got proof?

tricky.
because X=5s(X) + 1, X must be one more than a multiple of 5. (where s(X) is the sum of x's digits)

multiple of 5 split neatly into 2 groups, odd, and even. which will follow two different paterns for s(X).
if X is the age, and Y Y=5s(X) + 1, then we can draw this table.


Code:
Even: N 1 2 3 4 5 6 7 X 1 11 21 31 41 51 61 Y 6 11 16 21 26 31 36 here we can mark both series in relation to N X = 10(N -1) + 1 Y = 5N + 1 Odd: N 1 2 3 4 5 6 7 X 6 16 26 36 46 56 66 Y 31 36 41 46 51 56 61 and here: X = 10N - 4 Y = 5(N+5) + 1


in both cases were looking for instances where X = Y
so we can plot a graph of Y and X against N for each set(odd, even), and the points where they cross is our answer. we can also see that they are the only answers, because of the strait line (no squares in the equations).

phew, theres probably loads of mistakes in that as I did it off the top of my head with a 5 year old knowledge of gcse maths. theres also probably a much simpler way.
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-28, 17:07
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Quote:
Originally Posted by Amon rA
tricky.
because X=5s(X) + 1, X must be one more than a multiple of 5. (where s(X) is the sum of x's digits)

multiple of 5 split neatly into 2 groups, odd, and even. which will follow two different paterns for s(X).
if X is the age, and Y Y=5s(X) + 1, then we can draw this table.


Code:
Even: N 1 2 3 4 5 6 7 X 1 11 21 31 41 51 61 Y 6 11 16 21 26 31 36 here we can mark both series in relation to N X = 10(N -1) + 1 Y = 5N + 1 Odd: N 1 2 3 4 5 6 7 X 6 16 26 36 46 56 66 Y 31 36 41 46 51 56 61 and here: X = 10N - 4 Y = 5(N+5) + 1


in both cases were looking for instances where X = Y
so we can plot a graph of Y and X against N for each set(odd, even), and the points where they cross is our answer. we can also see that they are the only answers, because of the strait line (no squares in the equations).

phew, theres probably loads of mistakes in that as I did it off the top of my head with a 5 year old knowledge of gcse maths. theres also probably a much simpler way.


Why do you need something that complicated? Can't you just go:

Let his age be xy = 10x + y
10x + y = 5(x + y) + 1
5x - 4y = 1

and since both x and y must be integers between 0 and 10, you can guess and test:

x = 5, y = 6 ==> 56 years old
and
x = 1, y = 1 ==> 11 years old
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Old 2005-04-28, 18:34
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haha, owned....
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Man, I get real sweaty after I wack my dong. Yeah, cause I headbang while I do, and I can't really "Jump" (haha ) like VanHalen in a dorm room, so I just walk back and forth....haha a couple days ago I was jumping up and down on my bed, with my pants down and my roommate came in when I wasn't looking, hahaha.


This is my band's page
http://www.myspace.com/ferocitydentontx
 
Old 2005-04-28, 19:43
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Wow, I'm not even close to understanding any of this.
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A little section of Requiem's "I finally got laid" posts.
Quote:
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Wore her out before I could finish(which im grateful for)


Funeral Mulch; My brutal death metal band from West Michigan.
 
Old 2005-04-28, 22:45
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Quote:
Originally Posted by Kalmahswamp
Hah that question is worded so crazily I don't even know what to do

I have a pretty cool question having to do with Newton's Law of Cooling. Requires a lot of log work though so it can get tedious



Let me guess, you're doing differential equations in school.
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Old 2005-04-29, 23:06
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Quote:
Originally Posted by mrweijia
Why do you need something that complicated? Can't you just go:

Let his age be xy = 10x + y
10x + y = 5(x + y) + 1
5x - 4y = 1

and since both x and y must be integers between 0 and 10, you can guess and test:

x = 5, y = 6 ==> 56 years old
and
x = 1, y = 1 ==> 11 years old


bastard, leave me alone. I made it up on the spot.



... your proof, although using something I never thought of, doesnt include three or more figure numbers. last I heard people could live up to 121 or so, so it doesnt count as definative. im not going to think about it, but it would probably be easy to extend your idea to three figure numbers, but in a purely mathematical sense, you would need to account for all numbers not just 2, or even three figure numbers. you would need to show that these were the only two numbers there are in exsistance with these qualities, which you haven't.

had i come up with that instead, I would have posted it.
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-04-30, 00:26
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Quote:
Originally Posted by Amon rA
bastard, leave me alone. I made it up on the spot.



... your proof, although using something I never thought of, doesnt include three or more figure numbers. last I heard people could live up to 121 or so, so it doesnt count as definative. im not going to think about it, but it would probably be easy to extend your idea to three figure numbers, but in a purely mathematical sense, you would need to account for all numbers not just 2, or even three figure numbers. you would need to show that these were the only two numbers there are in exsistance with these qualities, which you haven't.

had i come up with that instead, I would have posted it.


I never thought of a 3 digit ages. It never actually came to mind that someone could be 100+. It wouldn't be hard to take into acount though, but that might open up possibilities for an extremely old grandpa.

100x + 10y + z = 5(x + y + z ) + 1
95x + 5y - 4z = 1

Actually, I plugged some numbers in and tried it. Obviously, you want y to be = 0, so that you don't get some ridiculously high number. And even if x = 1, z would have to be 23.5 which is unfeasible. So x must = 0, and a three digit number is out of the question.

A 4 digit age however...
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Old 2005-05-02, 09:49
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Quote:
Originally Posted by mrweijia
Why do you need something that complicated? Can't you just go:

Let his age be xy = 10x + y
10x + y = 5(x + y) + 1
5x - 4y = 1

and since both x and y must be integers between 0 and 10, you can guess and test:

x = 5, y = 6 ==> 56 years old
and
x = 1, y = 1 ==> 11 years old


This is not a proof as you are still utilizing trial and error. Amon's method offers a decent graphical proof.
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Old 2005-05-08, 10:08
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OK, here's one I'm particularly proud of - some of you might have seen these type of problems before. This one took me almost two hours to construct.

CUNT+
FUCK
=QUEEF

(Every letter stands for a number and all numerals are unique.)

Tee hee.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-05-08, 11:57
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Oh, I hate those!
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Old 2005-05-11, 15:16
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Quote:
Originally Posted by johnmansley
This is not a proof as you are still utilizing trial and error. Amon's method offers a decent graphical proof.


Oh ok. Fair enough.
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Old 2005-05-12, 01:48
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Quote:
Originally Posted by far_beyond_sane
OK, here's one I'm particularly proud of - some of you might have seen these type of problems before. This one took me almost two hours to construct.

CUNT+
FUCK
=QUEEF

(Every letter stands for a number and all numerals are unique.)

Tee hee.


What's wrong, metal monkeys? Too hard? Too busy flinging your shit through the bars of your cage? To busy drywalling the inside of your cranium with shitty beer?
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-05-12, 01:51
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Quote:
Originally Posted by far_beyond_sane
What's wrong, metal monkeys? Too hard? Too busy flinging your shit through the bars of your cage? To busy drywalling the inside of your cranium with shitty beer?


Haha, I've never seen a question like this so I have no idea how to answer it
 
Old 2005-05-12, 10:21
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Quote:
Originally Posted by far_beyond_sane
OK, here's one I'm particularly proud of - some of you might have seen these type of problems before. This one took me almost two hours to construct.

CUNT+
FUCK
=QUEEF

(Every letter stands for a number and all numerals are unique.)

Tee hee.


um ok
i did it.
Code:
5432 +9457 =14889
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"The complexity of the penguins' lifestyle testifies to a Divine Creator," said one commentator on Christian Answers. "To think that natural selection or even the penguins themselves could come up with the idea to migrate miles and miles multiple times each year without their partner or their offspring is a bit insulting to my intellect. How great is our God!"
 
Old 2005-05-12, 12:18
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Why do I get the sneaking suspicion you didn't do that by hand?

Either way, nice one. That's obviously right.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2005-05-12, 13:05
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Anybody care to explain the "continuosly compounding interest" concept?
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seems like you got a case of stupidphobia
 
Old 2005-05-12, 13:18
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No prob.

Think of normal compound interest, at a given interest rate r (%).

Over a length of time (divided into n coumpunding periods), you get the amount you put in multiplied by (1+r/100)^n. Simple, right?

Well, another way of writing 'continually compunding interest' is 'infinite interest'. The expression that you use for this is one of the definitions of the exponential function e.

In other words, for the previous problem, we got $100 at 6% over a year, yes? That would be $100 * (1.06)^1 if it compounded once. But compounding infinitely, we get a property of e [which = (1+n/infinity)^infinity.]

I'm a little drunk, so I hope the above makes sense - the final answer is $100*0.06*e, which is $106.18.

That's right. All that fuss for 18 fucking cents. I call gay on that.
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Old 2006-02-08, 08:20
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Here's a good one that was printed in the recent issue of Focus magazine. The answer was not provided as it was one of the questions that the mag offered a prize for, but anybody who is comfortable with trigonometry should find it a doddle. Here goes:

"Lem Goldfish is trying to decide between two paperweights made of the same material. The first is a regular tetrahedron. The second is a regular octahedron having the same side length as the tetrahedron. The tetrahedron weighs 1 kg. How much does the octahedran weigh?"

No guessing, I want to see proof!
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Old 2006-02-08, 08:24
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Is that bass perimeter length or actual like same length on ewach base side
 
Old 2006-02-08, 09:26
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What's wrong, metal monkeys? Too busy flinging your shit through the bars of your cage? To busy drywalling the inside of your cranium with shitty beer?


i dont live in a cage...
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Metal Monkey: retarded comments galore.

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Old 2006-02-08, 09:39
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i dont live in a cage...


Just what my night needed. A throw-away answer to a seven-month old joke from a fucking Queenslander. Shut your thick-lipped sinkhole, groinbreath.

No offense, Cumboy, but that question is way too easy.
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far_beyond_sane - contributing to the moral decay of your children since 1982

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Old 2006-02-08, 09:43
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Hey,whats a reciprocal.
 
Old 2006-02-08, 09:48
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2006-02-08, 10:06
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Originally Posted by far_beyond_sane
No offense, Cumboy, but that question is way too easy.


Yup. Let's see if anybody else can get it.
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Old 2006-02-08, 10:32
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What's Focus magazine? Must admit I've never heard of it.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2006-02-08, 10:40
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It's a watered down science magazine over here. I'm not sure if it's distributed worldwide.

Inifinity: each side of both objects is the same length. For example the tetrahedron (a three sided pyramid) has 6 sides all of the same length.
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Old 2006-02-08, 10:43
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In the 'New Scientist' mould? I don't read stuff like that.

Also, I'd like to know why a goldfish needs a paperweight. That's DERANGED.
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Old 2006-02-08, 10:53
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Yeah, like New Scientist only not as sciencey.
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Old 2006-02-08, 20:41
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Quote:
Originally Posted by far_beyond_sane
OK, here's one I'm particularly proud of - some of you might have seen these type of problems before. This one took me almost two hours to construct.

CUNT+
FUCK
=QUEEF

(Every letter stands for a number and all numerals are unique.)

Tee hee.

5437
+ 9452
_____
14889
i've created a prolog program last year to solve things like that
 
Old 2006-02-10, 08:20
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Quote:
Originally Posted by johnmansley
Here's a good one that was printed in the recent issue of Focus magazine. The answer was not provided as it was one of the questions that the mag offered a prize for, but anybody who is comfortable with trigonometry should find it a doddle. Here goes:

"Lem Goldfish is trying to decide between two paperweights made of the same material. The first is a regular tetrahedron. The second is a regular octahedron having the same side length as the tetrahedron. The tetrahedron weighs 1 kg. How much does the octahedran weigh?"

No guessing, I want to see proof!


Anyone? I thought somebody might've at least had a stab at it. OK, here's a clue: The volume of a pyramid with base of n sides is given by

V = 1/3 x Area of base x height
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Old 2006-02-10, 08:41
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Hows this for a lil equation ...
Ok say Infinity = X
so you would think X - X = 0 right?

ok so lets test it out.

X - X = 0
X = X
1 + X = X
1 = 0

haha cool ey, so infinity negative infinity can't equal 0 , you'd think it would ... let infinity burn in the depths of hell.
 
Old 2006-02-10, 08:54
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Quote:
Originally Posted by problematic
Hows this for a lil equation ...
Ok say Infinity = X
so you would think X - X = 0 right?

ok so lets test it out.

X - X = 0
X = X
1 + X = X
1 = 0

haha cool ey, so infinity negative infinity can't equal 0 , you'd think it would ... let infinity burn in the depths of hell.


This doesn't hold since 1 + infinity is a different infinity to infinity: The set infinity is contained within the set infinity + 1 but does not fill it and therefore the two sets cannot be considered equivalent. Hence, writing 1 + infinity = infinity is incorrect and by implication, 1 = 0 is also incorrect.

As an example of infinities, consider the infinite set of even integers. Now consider the infinite set of all integers. They both contain the same number of integers since both sets are infinite, right? Nope: The infinite set of integers is twice as large as the infinite set of even integers.
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Old 2006-02-10, 11:12
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L = length
D = Density, noting D(tet)=D(oct) since they are made of the same material.
D=M/V where M=mass, V=volume

So,

1/V(tet) = D = M(oct)/V(oct)

=> M(oct) = V(oct)/V(tet)

Now, V(pyramid) =1/3 x A x h

=> V(oct) =2{1/3 x L^2 x rt(L^2 - [L/2cos45]^2)}
=2/3 x L^2 x (L/rt2)
=(L^3 x rt2)/3
and

V(tet) = 1/3 x [0.5 x L x (Lsin60)] x rt(L^2 - [L/2cos30]^2)
= 1/6 x (rt3)/2 x L^2 x Lrt(2/3)
= (L^3 x rt2)/12

=> M(oct) = 12/3 = 4kg.

I think...
 
Old 2006-02-10, 11:15
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Spot on!
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Old 2006-02-10, 20:51
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Where the fuck is my calculator. Its got a TMV solver on it.
 
Old 2006-02-10, 20:52
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TMV?
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Old 2006-02-10, 21:11
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OK, here's another easy problem similar to that of the very first post of this thread, i.e. it is financially geared:

"In one year's time you are due to receive a £2,000 annuity in perpetuity. Assuming that the time value of money (interest rate) is set at 8% and will not change in the future, how much should you accept now as a one off payment in order to forgo the annuity?"
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Last edited by johnmansley : 2006-02-10 at 21:18. Reason: Cheers, PST!!!
 
Old 2006-02-10, 21:15
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Change that 'would' to 'should.' 'Would' makes every answer correct, if the person responding would accept that instead of the annuity, even if it would be damned stupid to do so. And this is the internet, so stupidity's presence should never be questioned.
 
Old 2006-02-10, 21:18
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Very true, mate. Edited.
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Old 2006-02-10, 21:26
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Actually here's another easy one (when you think about it) that people should know and may actually find helpful if they ever set up in business:

"You pay £500 including Value Added Tax (the "gross" amount) for a computer. The VAT rate in effect is 17.5%. What was the value of the computer before VAT was charged (the "net" amount)?"

Very, very easy, but it's surprising how many people can't work it out.
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Old 2006-02-11, 02:47
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Quote:
Originally Posted by problematic
Hows this for a lil equation ...


How is it? It's wrong.

Start here.
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"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2006-02-11, 23:01
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Quote:
Originally Posted by johnmansley
Actually here's another easy one (when you think about it) that people should know and may actually find helpful if they ever set up in business:

"You pay £500 including Value Added Tax (the "gross" amount) for a computer. The VAT rate in effect is 17.5%. What was the value of the computer before VAT was charged (the "net" amount)?"

Very, very easy, but it's surprising how many people can't work it out.

500 / 117.5 = 4.26
4.26 x 100 = 426

A pretty simple thing here:
Make the number 24 by using all 4 numbers, once each. You can only add, subtract, multiply and divide. Heres a few:
Set 1: 2, 22, 23, 24
Set 2: 7, 12, 16, 20
Set 3: 4, 19, 20, 30
Set 4: 4, 9, 12, 12

You can actually make them up yourselves; see if you can make a really hard one.

Last edited by BlackRoseImmortal : 2006-02-11 at 23:09.
 
Old 2006-02-12, 07:11
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Someone asked me why I choose to post at metaltabs instead of some of the bigger metal forums.

And i explained, we have math threads.
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Old 2006-02-12, 11:04
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Quote:
Originally Posted by BlackRoseImmortal
500 / 117.5 = 4.26
4.26 x 100 = 426


Yep. The VAT fraction is 7/47 and the fraction that yields the net amount is thus 40/47.
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Old 2006-02-21, 08:33
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Quote:
Originally Posted by johnmansley
OK, here's another easy problem similar to that of the very first post of this thread, i.e. it is financially geared:

"In one year's time you are due to receive a £2,000 annuity in perpetuity. Assuming that the time value of money (interest rate) is set at 8% and will not change in the future, how much should you accept now as a one off payment in order to forgo the annuity?"


Anyone?
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Old 2006-02-21, 09:15
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Originally Posted by johnmansley
Anyone?


When are we assuming I die?

And what about inflation?
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far_beyond_sane - contributing to the moral decay of your children since 1982

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Old 2006-02-21, 12:14
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Quote:
Originally Posted by far_beyond_sane
When are we assuming I die?

And what about inflation?


Assume that the perpetuity is passed on to your next of kin and that the time value of money has constant inflation built into it (it would be in the real world).

[Aside: in essence, since one will not live forever it could be argued that it is always beneficial to accept the lump sum amount rather than the perpetuity. However, it's the steady annual income that is attractive to most people as it prevents them from blowing the whole amount on beer and hookers within the first week]
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Old 2006-02-21, 13:30
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Oh.

Is this just C/r because of the sum to infinity of C/(1+r)^1 + C/(1+r)^2 + C/(1+r)^3... ? I never see questions like this.
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Old 2006-02-21, 13:51
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It is indeed!
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Old 2006-02-21, 14:46
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In that case, that was so easy I think you gave me cancer.

Here's some fun for you:

"All cunts are 'Tabbers. One-third of all 'Tabbers are cunts. Half of all
morons are 'Tabbers. Also, one moron is a cunt and eight morons are 'Tabbers. There are 90 'Tabbers.

"How many 'Tabbers are neither cunts nor morons?"

And no, it's not zero.
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far_beyond_sane - contributing to the moral decay of your children since 1982

"It was some kind of evolutionary glitch, she figured; no different than the other unreasonable side effects of consciousness and emotion, like religion and rap music."
 
Old 2006-02-21, 15:09
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Quote:
Originally Posted by far_beyond_sane
In that case, that was so easy I think you gave me cancer.

Here's some fun for you:

"All cunts are 'Tabbers. One-third of all 'Tabbers are cunts. Half of all
morons are 'Tabbers. Also, one moron is a cunt and eight morons are 'Tabbers. There are 90 'Tabbers.

"How many 'Tabbers are neither cunts nor morons?"

And no, it's not zero.


I make it 53 since:

90 'Tabbers

Less: 30 cunts, of which one is also a moron
Less: 7 morons, since one of the 8 morons is also a cunt

Which leaves 53.
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Old 2006-02-21, 15:46
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Yay Cumboy! You slay dragons! And, uh, maths questions.
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