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On (A={1,2,3,4}), (R=A\times A-{(1,1),(2,3),(4,4)}). How many pairs must be added to make (R) reflexive?

Answer and explanation

Correct answer: 2

Step 1: A reflexive relation needs all four diagonal pairs. Step 2: Among the removed pairs, ((1,1)) and ((4,4)) are diagonal, while ((2,3)) is not. Step 3: Therefore only two diagonal pairs must be added.

Related tags

Reflexive RelationCartesian ProductMissing DiagonalRelations And FunctionsMathematicsClass 12 Mcq

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