ChallengeSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemEvaluate ∑n=1∞2−nn2\displaystyle\sum_{n=1}^{\infty} 2^{- n} n^{2}n=1∑∞2−nn2.Check Show answer Walk through it step by step Practice more like this Review this concept