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AP® Calculus AB-BC

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Moderate

Sum of $\cfrac { { 3 }^{ n+1 } }{ { 4 }^{ n } }$

APCALC-Z1GR86

Find the value of:

$$\sum _{ n=0 }^{ \infty }{ \cfrac { { 3 }^{ n+1 } }{ { 4 }^{ n } } } $$

A

$12$

B

$4$

C

$3$

D

$\cfrac{9}{4}$