Find the radius of convergence of ∑n=0∞xnn!\displaystyle\sum_{n=0}^{\infty} \frac{x^n}{n!}n=0∑∞n!xn.
R=∞R = \inftyR=∞
R=1R = 1R=1
R=0R = 0R=0
R=eR = eR=e