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Mathematics
Problem
Determine the interval of convergence of the series
∑
n
=
1
∞
(
−
1
)
n
x
n
n
.
\sum_{n=1}^{\infty}\frac{(-1)^n x^{\,n}}{\sqrt{n}}.
n
=
1
∑
∞
n
(
−
1
)
n
x
n
.
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