1. The problem statement, all variables and given/known data Prove that if a_n>or equal to 0, and sum(a_n) converges, then sum(a_n)^2 also converges. 3. The attempt at a solution The only example I can think of is 1/(n^p) where p is any exponent greater than 1. Are there any other examples that I can use or do I only need to use this example to prove it?