E
Editor
Sep 18, 2022
$\sum_{n=1}^{\infty}\left(-\frac{3}{7}\right)^{2n}=\space?$
Difficulty: Easy
A:
$\frac{9}{40}$
B:
$\infty$
C:
0
D:
$\frac{3}{7}$
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ID: 63273dbaca83163ac3a12c21