If * be a binary operation on a set A and e be the identity element w.r.t. *, then b \in A is said to be inverse of a \in A w.r.t. *, if

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If * be a binary operation on a set A and e be the identity element w.r.t. *, then b∈A is said to be inverse of a∈A w.r.t. *, if

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