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On A = {1, 2, 3}, R = {(1,2), (2,3), (1,3)} is given. Is R transitive?

Answer and explanation

Correct answer: Yes, because the required pair (1,3) is present

Transitivity requires that whenever (a,b) and (b,c) belong to R, the pair (a,c) must also belong to R. In this relation, the only nontrivial chain is (1,2) followed by (2,3), which requires (1,3). That required pair is explicitly present. Other possible chains do not create a missing requirement: there are no pairs beginning with 3, and the available links do not produce another unfulfilled chain. Therefore R is transitive, so option A is correct. Reverse pairs are relevant to symmetry, not transitivity.

Related tags

Transitive RelationOrdered PairsRelation Verification

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