series; convergence, divergence...
Homework Statement
1. sum(infinity,n=1) n!/1.3.5...(2n-1)
2. sum(infinity, n=1) (-1)^n arcsin(-1/n)
3. sum(infinity, n=0) arcsin(1/n^2) / arctan(1/n^2)
The Attempt at a Solution
1. i used the ratio test and then i ended up with lim((n+1)(2n-1)/2n+1))...