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On A={1,2,3,4}, let R={(1,2),(2,4),(1,4),(3,3)}. Is R transitive?

Answer and explanation

Correct answer: Yes

Use the rule: whenever (a,b) and (b,c) belong to R, (a,c) must also belong to R. The only nontrivial chain is (1,2) followed by (2,4), and its required result (1,4) is already present. The pair (3,3) leads only to itself, which is present. No reverse pair such as (2,1) or (4,1) is demanded, so R is transitive and option A is correct.

Related tags

Transitive RelationOrdered PairsFinite Relation

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