Determine the radius of convergence of ∑n=0∞x2n2n\sum_{n=0}^{\infty} \frac{x^{2n}}{2^n}∑n=0∞2nx2n.
R=2R = \sqrt{2}R=2
R=2R = 2R=2
R=1/2R = 1/2R=1/2
R=4R = 4R=4