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A binary operation @ is defined on RR-{-...

A binary operation `@` is defined on `RR-{-1}` by `a@b=a+b+ab` for all `a,binRR-{-1}.`
(i) Discuss the commutativity and associativity of `@` on `RR-{-1}`.
Find the identity element, if exists.
(iii) Prove that every element of `RR-{-1}` is invertible.

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The correct Answer is:
(i) Commutative and associative (ii) 0
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