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_____ is the multiplicative identity of natural numbers.(a) 0(b) -1(c) 1(d) 2This question was posed to me during an interview.My question is based upon Groups topic in section Groups of Discrete Mathematics

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Right CHOICE is (C) 1

For explanation I would say: 1 is the multiplicative identity of natural NUMBERS as a⋅1=a=1⋅a ∀a∈N. Thus, 1 is the identity of multiplication for the set of integers(Z), set of rational numbers(Q), and set of real numbers(R).



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