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On the set R-{-1} a binary operation * i...

On the set `R-{-1}` a binary operation `*` is defined by `a*b=a+b+a b` for all `a , b in R-1{-1}` . Prove that * is commutative as well as associative on `R-{-1}dot` Find the identity element and prove that every element of `R-{-1}` is invertible.

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