1.) one of the following series converges absolutely one converges conditionally, the other diverges which is which
a.)sum (-1)^n (1/(sqrt(n)))
b.) sum (-1)^n (sqrt(n)/(1+sgrt(n)))
c.) sum (-1)^n (1/( n(1+sqrt(n)))
2.) test for convergence the sum of ((2n+n^3)/(3+n^4))
This shows how to determine convergence and divergence.