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Mathematics
Mathematics
Problem
Evaluate:
∑
k
=
2
∞
1
3
(
−
1
2
)
k
\sum_{k=2}^{\infty} \frac{1}{3}\left(-\frac{1}{2}\right)^{k}
k
=
2
∑
∞
3
1
(
−
2
1
)
k
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