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If (S={1,2,3}) and (A=\mathcal{P}(S)). (R={(X,Y):X\cap Y=\varnothing}). How many diagonal pairs must be added to make (R) reflexive?

Answer and explanation

Correct answer: 7

Step 1: (A) has (8) sets, so (8) diagonal pairs are needed. Step 2: On the diagonal, (X\cap X=X), which is empty only when (X=\varnothing). Step 3: One diagonal pair is already present, so (8-1=7) must be added.

Related tags

Reflexive RelationPower SetIntersectionRelations And FunctionsMathematicsClass 12 Mcq

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