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On (A={1,2,3,4}), (R) is reflexive and symmetric and has 12 total pairs. How many such relations are possible?

Answer and explanation

Correct answer: 15

Step 1: The 4 self-pairs are fixed. Step 2: For 12 total pairs, 8 non-self pairs are needed, meaning 4 unordered pairs are chosen in both directions. Step 3: Choose 4 of the 6 unordered pairs in (\binom{6}{4}=15) ways.

Related tags

Reflexive SymmetricTotal PairsCombinationsHardReflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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