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On positive real numbers, (a*b=\sqrt{ab}) is defined. Choose the correct statement about associativity of this operation.

Answer and explanation

Correct answer: It is not associative

Step 1: For associativity, ((a*b)*c=a*(b*c)) must hold. Step 2: Here ((a*b)*c=\sqrt{c\sqrt{ab}}) and (a*(b*c)=\sqrt{a\sqrt{bc}}), which are not equal in general. Step 3: A small counterexample is a quick way to disprove associativity.

Related tags

Binary OperationsAssociativityCounterexamplePositive RealsRelations And FunctionsMathematicsClass 12 Mcq

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