Answer
$S=27$
Work Step by Step
$a_1=9$
$r=\frac{a_2}{a_1}=\frac{6}{9}=\frac{2}{3}$
$S=\frac{a_1}{1-r}=\frac{9}{1-\frac{2}{3}}=\frac{9}{\frac{1}{3}}=27$
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