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On (\mathbb{Z}), (a*b=\frac{a+b}{2}) is defined. Why is it not a binary operation?

Answer and explanation

Correct answer: Because the result is not always an integer

Step 1: For a binary operation, the result must remain in (\mathbb{Z}). Step 2: (1*2=\frac{3}{2}), which is not an integer. Step 3: One counterexample is enough to disprove closure.

Related tags

Binary OperationsNot ClosedCounterexampleRelations And FunctionsMathematicsClass 12 Mcq

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