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Mathematics
Mathematics
Problem
Find the exact value of the series
∑
n
=
0
∞
7
(
−
2
3
)
n
\displaystyle \sum_{n=0}^{\infty} 7\left(-\frac{2}{3}\right)^n
n
=
0
∑
∞
7
(
−
3
2
)
n
.
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