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