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On positive real numbers, (a*b=\sqrt{ab}). Choose the correct conclusion about this operation.

Answer and explanation

Correct answer: Commutative but not associative

Step 1: Since (ab=ba), (a*b=b*a), so the operation is commutative. Step 2: ((a*b)*c=\sqrt{c\sqrt{ab}}), while (a*(b*c)=\sqrt{a\sqrt{bc}}), not equal in general. Step 3: Values like (a=1,b=4,c=16) quickly disprove associativity.

Related tags

Binary OperationsPositive RealsCommutativeNot AssociativeRelations And FunctionsMathematicsClass 12 Mcq

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