ChallengeMedium ShareChallenge · Medium problemLet FnF_{n}Fn denote the Fibonacci numbers with F1=F2=1F_{1}=F_{2}=1F1=F2=1 and Fn+2=Fn+1+FnF_{n+2}=F_{n+1}+F_{n}Fn+2=Fn+1+Fn. Evaluate ∑n=1∞Fn2n\displaystyle\sum_{n=1}^{\infty}\dfrac{F_{n}}{2^{n}}n=1∑∞2nFn.Check Show answer Walk through it step by step Practice more like this