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Mathematics
Problem
Determine the interval of convergence of the series
∑
n
=
0
∞
n
2
(
x
+
2
)
n
4
n
.
\sum_{n=0}^{\infty}\frac{n^{2}(x+2)^{n}}{4^{n}}.
n
=
0
∑
∞
4
n
n
2
(
x
+
2
)
n
.
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