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Mathematics
Problem
What is the radius of convergence of the series
∑
n
=
0
∞
(
x
−
4
)
2
n
3
n
\sum_{n=0}^{\infty} \frac{(x-4)^{2n}}{3^n}
∑
n
=
0
∞
3
n
(
x
−
4
)
2
n
?
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