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  1.  The set of integers Z with the binary operation "*" defined as a*b =a +b+ 1 for a, b ∈ Z, is a group. The identity element of this group is

    2. A.

    -1
    B.

    0
    C.

    1
    D.

    2

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    Answer : Option A

    Explanation :

    -1

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