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## Homework Statement

Prove that if a_n>or equal to 0, and sum(a_n) converges, then sum(a_n)^2 also converges.

## 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?