Determine the radius of convergence RRR for the power series ∑n=1∞n2xn3n\sum_{n=1}^{\infty} \frac{n^2 x^n}{3^n}∑n=1∞3nn2xn.
R=1R = 1R=1
R=3R = 3R=3
R=1/3R = 1/3R=1/3
R=∞R = \inftyR=∞