PutnamSuperchallengeIntegrals I: Feynman's Trick ShareIntegrals I: Feynman's Trick · Superchallenge problemCompute ∑n=0∞n+13n\displaystyle\sum_{n=0}^\infty \frac{n+1}{3^n}n=0∑∞3nn+1. Express your answer as a common fraction.Check Show answer Walk through it step by step Practice more like this Review this concept