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On (A={1,2,3,4,5}), (aRb) if and only if (|a-b|) is divisible by (3). What are the equivalence classes of this relation?

Answer and explanation

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

Step 1: (|a-b|) being divisible by (3) means the numbers have the same remainder modulo (3). Step 2: Remainder (1) gives ({1,4}), remainder (2) gives ({2,5}), and remainder (0) gives ({3}). Step 3: Elements with the same remainder form one equivalence class.

Related tags

Absolute DifferenceModulo 3Equivalence ClassesFinite SetEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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