sider the following repeating decimal.

$\frac{0\mathrm{.}6}{b}ar(18)$

$($a$)$ Write the repeating decimal as a geometric series.

$\frac{0\mathrm{.}6}{b}ar(18)=,{\displaystyle \underset{n=0}{\overset{}{}}},(,)$

$($b$)$ Write the sum of the series as the ratio of two integers.