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State the reason for the relation R on t...

State the reason for the relation `R` on the set {1, 2, 3} given by `R={(1,\ 2),\ (2,\ 1)}` not to be transitive.

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The correct Answer is:
`(1,2) in R` and `(2,1) in R ` but `(1,1) cancelin R`
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