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On (\mathbb{R}^{+}), (a*b=\frac{ab}{a+b}). Which property does this operation satisfy?

Answer and explanation

Correct answer: It is commutative

Step 1: (\frac{ab}{a+b}=\frac{ba}{b+a}), so the operation is commutative. Step 2: For positive (a,b), the result is also positive, so it is closed. Step 3: Identity would need (\frac{ae}{a+e}=a), giving (ae=a^2+ae), impossible for (a>0).

Related tags

Binary OperationsPositive RealsCommutativeRelations And FunctionsMathematicsClass 12 Mcq

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