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Infinite Series
hard
0:00.0
Evaluate
∑
n
=
1
∞
n
2
2
n
\sum_{n=1}^{\infty} \frac{n^2}{2^n}
∑
n
=
1
∞
2
n
n
2
.
A
2
2
2
B
4
4
4
C
6
6
6
D
8
8
8
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