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On A={1,2,3}, let R={(1,2),(2,3)}. Why is R not transitive?

Answer and explanation

Correct answer: Because (1,3) is missing

A relation R is transitive when, for any a, b, and c, the presence of (a,b) and (b,c) guarantees the presence of (a,c). Here, (1,2) and (2,3) are both in R, so transitivity requires (1,3). That ordered pair is absent. The reverse pair (2,1) and self-pair (1,1) are not required by transitivity, so option A is correct.

Related tags

Transitive RelationMissing Ordered PairClass 12

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