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On (A={1,2,3,4}), (R) is reflexive and symmetric and has total 8 pairs. How many such relations are possible?

Answer and explanation

Correct answer: 15

Step 1: The 4 self-pairs are fixed by reflexivity. Step 2: For 8 total pairs, 4 non-self pairs are needed, meaning 2 unordered pairs are included in both directions. Step 3: Choose 2 of the 6 unordered pairs, giving (\binom{6}{2}=15).

Related tags

Reflexive SymmetricExact SizeCombinationHardReflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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