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If a**b = a +b - ab on Q^(+) , then the...

If `a**b = a +b - ab ` on `Q^(+)` , then the identity and the inverse of a for `**` are respectively ..........

A

`0 and (a)/(a-1)`

B

`1 and (a-1)/a`

C

`-1 and a`

D

`0,(1)/a`

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A
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