SAT Math Practice Question #28741 - SATify | SATify

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SAT Math Practice Question #28741 - SATify | SATify

#28741

algebra

series

Telescoping Series

medium

90 sec

The sum of an infinite geometric series is $S$ . The first term is $a_{1}$ . If the second term is $4$ , and $S = 2 a_{1}$ , what is $S$ ?

A.

$12$

B.

$14$

C.

$16$

D.

$18$

E.

$20$