PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemEvaluate ∑n=0∞(2nn)15n\displaystyle\sum_{n=0}^{\infty}\binom{2n}{n}\frac{1}{5^n}n=0∑∞(n2n)5n1. Express your answer in simplest radical form.Check Show answer Walk through it step by step Practice more like this Review this concept