Posted by **jane** on Tuesday, March 4, 2008 at 10:05pm.

find the radius and interval of convergence for the series

the series from n=1 to infinity of

((-1)^(n+1)*x^n)/n!

I did the ratio test so I had the Lim as n approaches infinity of -x/(n+1), but this is 0, giving no radius, so I think I did something wrong...