Question

Trouble understating a Telescope series part of question.

Answer 1

\[\sum_{n =1} \frac{2}{n^2-1)}\]

Answer 2

\[
n^2-1 = (n-1)(n+1)
\]

Answer 3

So, its a test for divergence what I did was
2/(n-1)(n+1) = 1/(n-1) - (1/n+1)