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Which relation is reflexive on A={1,2,3}?

Answer and explanation

Correct answer: {(1,1),(2,2),(3,3),(1,2)}

Answer: A. A relation R on A is reflexive when every element is related to itself. Therefore, for A={1,2,3}, the compulsory diagonal ordered pairs are (1,1), (2,2), and (3,3). A relation may also contain extra pairs, so the additional pair (1,2) in option A does not cause any problem. Option B is not reflexive because (3,3) is missing. Option C has none of the three required diagonal pairs, so it fails immediately. Option D contains (1,1) and (3,3), but it omits (2,2), so it also fails. A useful memory cue is: reflexive means every element points back to itself; first check the diagonal pairs, and only then consider extra pairs.

Related tags

RelationsReflexive RelationDiagonal PairsRelations And FunctionsMathematicsClass 12 Mcq

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