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# An Infinite Rational Sum

APCALC-JZUF1S

Find the sum of the given series:

$$\displaystyle\sum_{n=0}^{\infty }\cfrac{5^{n}+4^{n}}{6^{n}}$$

A

The sum does not exist (the series diverges).

B

$9$

C

$7$

D

$\cfrac{9}{4}$