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If (A) has (n) elements, how many reflexive relations must contain one fixed non-diagonal pair ((p,q)), where (p\neq q)?

Answer and explanation

Correct answer: (2^{n^2-n-1})

Step 1: A reflexive relation must contain the (n) diagonal pairs. Step 2: There are (n^2-n) non-diagonal pairs, and one fixed non-diagonal pair is also compulsory. Step 3: The remaining (n^2-n-1) pairs are optional, giving (2^{n^2-n-1}).

Related tags

Reflexive RelationGeneral CountingRestricted PairRelations And FunctionsMathematicsClass 12 Mcq

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