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On real numbers, (a*b=a+2b). Which property does this operation not satisfy?

Answer and explanation

Correct answer: Commutativity

Step 1: If (a,b) are real, then (a+2b) is also real, so closure holds. Step 2: Commutativity would require (a+2b=b+2a) always, but for (a=1,b=2), (1*2=5) and (2*1=4). Step 3: One valid counterexample is enough to disprove commutativity.

Related tags

Binary OperationCommutativityCounterexampleReal NumbersBinary OperationsRelations And FunctionsMathematicsClass 12 Mcq

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