Attachment 30530

Hi, I couldnt do these 3 questions. Anyone can help which method to use please?

I tried divergence test for d. but I got 0 which means divergence test failed. and....

h) I used l'ho and got 1. is that correct?

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- Mar 26th 2014, 09:27 PMcscSeries
Attachment 30530

Hi, I couldnt do these 3 questions. Anyone can help which method to use please?

I tried divergence test for d. but I got 0 which means divergence test failed. and....

h) I used l'ho and got 1. is that correct? - Mar 27th 2014, 07:44 AMzzephodRe: Series
The first is a series with $$a_n=-\frac{1}{n(n+1)}$$ here $|a_n|<1/(n+1)^2$ and since $\sum_{i=2}^{\infty}1/n^2$ converges the series here converges absolutely and so converges by the comparison test.

. - Mar 27th 2014, 07:47 AMzzephodRe: Series
- Mar 27th 2014, 08:05 AMPlatoRe: Series