Find the radius of convergence RRR of the power series ∑n=0∞n33nxn\sum_{n=0}^{\infty} \frac{n^3}{3^n} x^n∑n=0∞3nn3xn.
R=1R = 1R=1
R=3R = 3R=3
R=1/3R = 1/3R=1/3
R=∞R = \inftyR=∞