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On (A={1,2,3,4}), a symmetric relation (R) has exactly (2) diagonal pairs and exactly (2) off-diagonal mirror-pair groups. How many such relations are possible?

Answer and explanation

Correct answer: (\binom{4}{2}\binom{6}{2})

Step 1: Choose (2) diagonal pairs from (4) in (\binom{4}{2}) ways. Step 2: Choose (2) off-diagonal mirror groups from (6) in (\binom{6}{2}) ways. Step 3: The choices are independent, so the total is (\binom{4}{2}\binom{6}{2}).

Related tags

Advanced CountingSymmetric RelationCombinationsRelations And FunctionsMathematicsClass 12 Mcq

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