Answer
$111_2$
Work Step by Step
$\ \ \overset01\ \overset{1}0\ \overset{10}1\ \overset10\ \overset{10}0_2$
$\ \underline{ -1\ \ 1\ \ 0\ \ 1_2}$
$\ \ \ \ \ \ \ \ 1\ \ 1\ \ 1_2$
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