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On (A={1,2,3,4,5,6}), (aRb) holds when (a^2+b^2) is even. What are the equivalence classes of this relation?

Answer and explanation

Correct answer: ({1,3,5},{2,4,6})

Step 1: The square of a number has the same parity as the number. Step 2: (a^2+b^2) is even only when (a) and (b) have the same parity. Step 3: Hence the classes are the odd and even numbers.

Related tags

ParitySquare SumEquivalence ClassesEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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