Answer
$111R1$
Work Step by Step
$\ \ \ \ \ \,111$
$9\bigr)\overline{1000}$
$\,\ \ \ \ \ \underline9$
$\ \ \ \ \ \ 10$
$\,\ \ \ \ \ \ \ \underline9$
$\ \ \ \ \ \ \ \ 10$
$\ \ \,\ \ \ \ \ \ \ \underline9$
$\ \ \ \ \ \ \ \ \ \ 1$
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