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On (\mathbb{R}^{+}), (a*b=\frac{a+b}{2}). Which statement is correct?

Answer and explanation

Correct answer: It is closed and commutative, but not associative

Step 1: The average of two positive numbers is positive, so closure holds. Step 2: (\frac{a+b}{2}=\frac{b+a}{2}), so it is commutative. Step 3: ((2*4)*8=3*8=\frac{11}{2}), but (2*(4*8)=2*6=4), so it is not associative.

Related tags

Binary OperationsAverageNon AssociativeRelations And FunctionsMathematicsClass 12 Mcq

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