ap-calculus-bc 2012 Q13

ap-calculus-bc · Usa · practice-exam Sequences and Series Power Series Expansion and Radius of Convergence
What is the radius of convergence of the series $\sum _ { n = 0 } ^ { \infty } \frac { ( x - 4 ) ^ { 2 n } } { 3 ^ { n } }$ ?
(A) $2 \sqrt { 3 }$
(B) 3
(C) $\sqrt { 3 }$
(D) $\frac { \sqrt { 3 } } { 2 }$
(E) 0
What is the radius of convergence of the series $\sum _ { n = 0 } ^ { \infty } \frac { ( x - 4 ) ^ { 2 n } } { 3 ^ { n } }$ ?

(A) $2 \sqrt { 3 }$

(B) 3

(C) $\sqrt { 3 }$

(D) $\frac { \sqrt { 3 } } { 2 }$

(E) 0