What is the radius of convergence of the power series f(x)=∑n=1∞n⋅xnf(x) = \sum_{n=1}^{\infty} n \cdot x^nf(x)=∑n=1∞n⋅xn?
R=0R = 0R=0
R=1R = 1R=1
R=∞R = \inftyR=∞
R=eR = eR=e