Find the radius of convergence of the power series ∑n=1∞(x−1)nn⋅3n\sum_{n=1}^{\infty} \frac{(x-1)^n}{n \cdot 3^n}∑n=1∞n⋅3n(x−1)n
R=1R = 1R=1
R=3R = 3R=3
R=13R = \frac{1}{3}R=31
R=9R = 9R=9