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If an equivalence relation on (A={1,2,3}) contains ((1,2)) and ((2,3)), what is the minimum number of pairs in (R)?

Answer and explanation

Correct answer: (9)

Step 1: Since ((1,2)) and ((2,3)) are present, transitivity connects (1) and (3). Step 2: With symmetry and reflexivity, all three elements are in one class. Step 3: One class of size (3) gives (3^2=9) pairs.

Related tags

Minimum PairsClosureEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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