Find the radius of convergence of ∑n=1∞(x−1)nn⋅2n\sum_{n=1}^{\infty} \frac{(x-1)^n}{n \cdot 2^n}∑n=1∞n⋅2n(x−1)n.
R=1R = 1R=1
R=2R = 2R=2
R=1/2R = 1/2R=1/2
R=4R = 4R=4