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On real numbers, (a*b=a+b-ab) is defined. Which element does not have an inverse?

Answer and explanation

Correct answer: (1)

Step 1: Since (a*0=a), the identity is (0). Step 2: (a*x=0\Rightarrow a+x-ax=0\Rightarrow x(1-a)=-a). If (a=1), no value of (x) can satisfy it. Step 3: While finding inverse, check where factors like (1-a) become zero.

Related tags

Binary OperationsInverse ExistenceReal NumbersExceptionRelations And FunctionsMathematicsClass 12 Mcq

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