Determine the radius of convergence for ∑n=0∞xn3n\sum_{n=0}^{\infty} \frac{x^n}{3^n}∑n=0∞3nxn.
R=1R=1R=1
R=3R=3R=3
R=1/3R=1/3R=1/3
R=9R=9R=9