Find the radius of convergence for ∑n=1∞n!⋅xn(2n)!\sum_{n=1}^{\infty} \frac{n! \cdot x^n}{(2n)!}∑n=1∞(2n)!n!⋅xn.
R=∞R = \inftyR=∞
R=4R = 4R=4
R=1R = 1R=1
R=0R = 0R=0