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Let $Q_1 = Q - \{1 \}$ the set of all rationals except 1, $*$ is the operation defined on $Q_1$, as $a * b = a + b - ab \; \forall a, b \in Q_1$. The inverse of 2 is :


( A ) 0
( B ) -2
( C ) 2
( D ) 1

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