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Prove that the operaton ** on QQ-{1} giv...

Prove that the operaton `**` on `QQ-{1}` given by `a*b=a+b-ab` for all `a,binQQ-{1}`
(i) is closed:
(ii) satisfies the commutative and associative laws,
(iii) Find the identity element,
(iv) Find the inverse of any element `ainQQ-{1}.`

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