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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?