Answer
$=\dfrac {3}{111}$
Work Step by Step
$0.\overline {027}=0.027027...=\dfrac {27}{1000}+\dfrac {27}{1000^{2}}+...=\dfrac {a_{1}}{1-r}=\dfrac {\dfrac {27}{1000}}{1-\dfrac {1}{000}}=\dfrac {27}{999}=\dfrac {3}{111}$
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