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On (\mathbb{Z}), (a*b=a+b+ab). Which of the following elements is not its own inverse?

Answer and explanation

Correct answer: (1)

Step 1: To be self-inverse, (a*a=0). Step 2: (a*a=a^2+2a=a(a+2)), so only (a=0) and (a=-2) are self-inverse. Step 3: (1*1=3\neq0), so (1) is not its own inverse.

Related tags

Binary OperationsSelf InverseIntegersRelations And FunctionsMathematicsClass 12 Mcq

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