Find the Radius of Convergence of the Power Series $\sum _ { n = 0 } ^ { \infty } \frac { ( 5 x ) ^ { 2 n } } { ( 2 n ) ! }$

Multiple Choice

Find the radius of convergence of the power series. $\sum _ { n = 0 } ^ { \infty } \frac { ( 5 x ) ^ { 2 n } } { ( 2 n ) ! }$

A) 0
B) 5
C) 10
D) 25
E) $\infty$