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If (A={1,2,3,4}) and (P={(1,2),(2,1),(4,4)}), how many reflexive relations (R) on (A) satisfy (P\subseteq R)?

Answer and explanation

Correct answer: (2^{10})

Step 1: (A\times A) has 16 pairs, and 4 self-pairs are compulsory in a reflexive relation. Step 2: In (P), ((4,4)) is already counted among self-pairs, while ((1,2)) and ((2,1)) are two extra fixed pairs. Step 3: So 6 pairs are fixed, (16-6=10) pairs are free, and the count is (2^{10}).

Related tags

Reflexive RelationCountingSubset ConditionHardRelations And FunctionsMathematicsClass 12 Mcq

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