問題詳情

11. If the interval of convergence for power series 

 is (-2,2) , then the interval ofconvergence for power series 

is : 


(A) (−√2, √2)
(B) (−2, 2)
(C) (0, 4)
(D) (1− √2,1+ √2)
(E) (−1,1)

參考答案