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Show that the binary operation * on A=R-...

Show that the binary operation * on `A=R-{-1}` defined as `a*b=a+b+a b` for all `a ,bA` is commutative and associative on `Adot` Also find the identity element of `*` in `A` and prove that every element of A is invertible.

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XII BOARDS PREVIOUS YEAR-BOARD PAPER SOLUTIONS-All Questions
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