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On (A={1,2,3}), how many reflexive relations contain exactly one of ((1,2)), ((2,3)), and ((3,1))?

Answer and explanation

Correct answer: 24

Step 1: The 3 self-pairs are compulsory. Step 2: Choose exactly 1 of the given 3 non-self pairs in (\binom{3}{1}=3) ways. Step 3: The remaining 3 non-self pairs are free, so the count is (3\times2^3=24).

Related tags

Exactly OneReflexive RelationOrdered PairsHardRelations And FunctionsMathematicsClass 12 Mcq

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