# Thread: Need help with Series

1. ## Need help with Series

Hi.
Evaluate.

$\Sigma^{\infty}_{n = 1}\frac{4^{2n}}{n! n^2}$

2. What makes you think it has a cloesd form? I foresee some $Ei(x)$s

3. Try ratio.. Or one of those tests to see if your series converges.

4. See here : http://www.mathhelpforum.com/math-he...lp-series.html

I sometimes feel so useful