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Find whether the following operations are binary operation or not (i) *on N defined by a * b = ab (ii) * on Z defined by a * b = ab |
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Answer» (i) For a, b ∈ N, a * b = ab is a unique natural number * is a binary operation on N. (ii) Let a,b ∈ Z+, a * b = ab ∈ Z+ * is a binary operation on Z+. |
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