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If Q(1)is the set of all rationals other...

If `Q_(1)`is the set of all rationals other than 1 with the binary operation defined by a. b = a + b - ab for all a, b in `Q_(1)`, then the identity in `Q_(1)` with respect to is

A

1

B

0

C

`-1`

D

2

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The correct Answer is:
B
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