Answer
$\frac{13}{99}$
Work Step by Step
Following the example: $0.1313...=13(0.01)+13(0.01)^2+...=\frac{a_1}{1-r}=\frac{13(0.01)}{1-0.01}=\frac{0.13}{0.99}=\frac{13}{99}$
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