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On (A={1,2,3}), (R) is reflexive and symmetric and has total 7 pairs. How many such relations are possible?

Answer and explanation

Correct answer: 3

Step 1: Reflexivity fixes the 3 self-pairs. Step 2: To have 7 total pairs, 4 non-self pairs are needed, meaning 2 unordered pairs are taken in both directions. Step 3: Choose 2 of the 3 unordered pairs in (\binom{3}{2}=3) ways.

Related tags

Reflexive SymmetricTotal PairsCountingClass 12Reflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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