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Single Variable Calculus

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Sum of a Geometric Series 2

SVCALC-EMEJDY

The geometric series:

$$\sum_{n=0}^\infty r^n$$

...equals $4$. What is $r$?

A

$-\cfrac{7}{8}$

B

$-\cfrac{2}{3}$

C

$-\cfrac{1}{8}$

D

$\cfrac{2}{5}$

E

$\cfrac{3}{4}$