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Geometric Sequences
hard
0:00.0
Find the sum of the series
∑
n
=
1
∞
n
3
n
\sum_{n=1}^{\infty} \frac{n}{3^n}
∑
n
=
1
∞
3
n
n
.
A
3/4
B
1/2
C
2/3
D
3/8
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