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?

 

:nervous:

god i hate math. just looking at that makes my head hurt.

 

it should. i can do everything else and then i get to this and i'm just WTF about it

 

3/2 ?

edit

start writing out a few terms starting with 2 and sum up whatever doesnt cancel out

 

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?

 

OH IT REALLY DOES ALL CANCEL OUT....

So that makes it a fairly simple problem.

yay for 2 hours on it.

 

edit: you got it

 

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