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Old Apr 27, 2005 | 07:17 PM
  #1  
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redgoober4life
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argh. i have no idea how to approach these...

it's set up the sum of (2/(n^2-1) n=2.... so i use partial fractions to get

[1/n-1 + -1/n+1]

but then what do I do?
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Old Apr 27, 2005 | 07:29 PM
  #2  
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:nervous:

god i hate math. just looking at that makes my head hurt.
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Old Apr 27, 2005 | 07:33 PM
  #3  
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it should. i can do everything else and then i get to this and i'm just WTF about it
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Old Apr 27, 2005 | 07:34 PM
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3/2 ?

edit

start writing out a few terms starting with 2 and sum up whatever doesnt cancel out
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Old Apr 27, 2005 | 07:41 PM
  #5  
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I eat plastic.
 
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i think i see what you got (before you said it, but...)

question: will everything after the first two times (subsituting in 2 and 3, in this case) cancel out? so you're just left with the 1 and the 1/2? i'm very confused on this part. how do we know it's only 3/2 and not something more?
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Old Apr 27, 2005 | 07:45 PM
  #6  
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redgoober4life
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I eat plastic.
 
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OH IT REALLY DOES ALL CANCEL OUT....

So that makes it a fairly simple problem.

yay for 2 hours on it.
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Old Apr 27, 2005 | 07:47 PM
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edit: you got it

Last edited by Misa; Apr 27, 2005 at 07:47 PM. Reason: nevermind
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Old Apr 27, 2005 | 07:49 PM
  #8  
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I eat plastic.
 
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I WANT SOME SNAPS!!!

Thank you for helping (although i was starting to get it before I read your post, if you couldn't tell).
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Old Apr 27, 2005 | 07:51 PM
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Originally Posted by redgoober4life
I WANT SOME SNAPS!!!

Thank you for helping (although i was starting to get it before I read your post, if you couldn't tell).
henceforth the edit
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