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If (R) is a symmetric relation and it has (7) pairs in total, what is correct about the number of off-diagonal pairs?

Answer and explanation

Correct answer: It must be even

Step 1: Any off-diagonal pair ((a,b)) must appear with its reverse pair ((b,a)). Step 2: So off-diagonal pairs are counted in pairs. Step 3: Hence, their number must be even, even if the total number of relation pairs is odd.

Related tags

Symmetric RelationOff Diagonal PairsCountingClass 12Relations And FunctionsMathematicsClass 12 Mcq

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