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On (A={1,2,3,4}), how many symmetric relations contain no diagonal pair?

Answer and explanation

Correct answer: (2^6)

Step 1: All (4) diagonal pairs are fixed as absent. Step 2: Only the off-diagonal unordered pairs remain free, and their number is (\frac{4\cdot3}{2}=6). Step 3: Each of these (6) blocks can be included or excluded.

Related tags

Symmetric RelationIrreflexive SymmetricCountingRelations And FunctionsMathematicsClass 12 Mcq

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