Suppose the power series \(\displaystyle \sum_{n=1}^{\infty}a_nx^n\) converges at \(x=4\) and \(x=-3\), at which of the following values of \(x\) is the series definitely convergent (select one or more)?多项选择题
A
a. 5
B
b. 3
C
c. -5
D
d. -2
E
e. -1
F
f. 1
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