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On (A={-1,0,1}), (a*b=a+b-ab) is defined. Is it a binary operation on (A)?

Answer and explanation

Correct answer: No because ((-1)*(-1) \notin A)

Step 1: A binary operation needs closure for every ordered pair. Step 2: ((-1)*(-1)=-1-1-1=-3), and (-3 \notin A). Step 3: If closure fails even once, the operation is not binary on the set.

Related tags

Binary OperationsClosureCounterexampleRelations And FunctionsMathematicsClass 12 Mcq

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