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On (A={1,2,3,4}), (R={(a,b):|a-b|\text{ is positive}}). What is (R) with respect to reflexivity?

Answer and explanation

Correct answer: Not reflexive

Step 1: On the diagonal, (|a-a|=0). Step 2: (0) is not positive, so no diagonal pair belongs to the relation. Step 3: A reflexive relation needs all diagonal pairs, so this relation is not reflexive.

Related tags

Reflexive RelationAbsolute ValuePositive DifferenceRelations And FunctionsMathematicsClass 12 Mcq

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