Determine the radius of convergence RRR for the power series ∑n=0∞n!3nxn\sum_{n=0}^{\infty} \frac{n!}{3^n} x^n∑n=0∞3nn!xn.
R=0R = 0R=0
R=3R = 3R=3
R=1/3R = 1/3R=1/3
R=∞R = \inftyR=∞