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Power Series
hard
0:00.0
Calculate the sum
S
=
∑
n
=
1
∞
n
2
n
S = \sum_{n=1}^{\infty} \frac{n}{2^n}
S
=
∑
n
=
1
∞
2
n
n
.
A
1
1
1
B
2
2
2
C
3
3
3
D
1
/
2
1/2
1/2
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