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VIT Engineering VIT Engineering Solved Paper-2015

  • question_answer
    If N is a set of natural numbers, then under binary operation a.b = a + b, (N,.) is

    A) quasi-group                       

    B) semi-group

    C) monoid               

    D) group

    Correct Answer: B

    Solution :

    The structure (N,.) satisfies the closure property, associativity and commutativity. But the identity element 0 does not belong to N. Hence, -N is a semi-group.


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