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On real numbers, (a*b=2a+3b) is defined. Does this operation have an identity element?

Answer and explanation

Correct answer: No

Step 1: For a right identity, (a*e=a\Rightarrow 2a+3e=a), giving (3e=-a), which depends on (a). Step 2: No fixed (e) works for all (a). Step 3: An identity must be a fixed element, not a value depending on (a).

Related tags

Binary OperationsIdentityLinear OperationReal NumbersRelations And FunctionsMathematicsClass 12 Mcq

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