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Which transitivity requirement fails for R={(1,1),(2,2),(3,3),(4,4),(1,2),(2,3),(3,4),(1,3),(2,4)} on A={1,2,3,4}?

Answer and explanation

Correct answer: (1,2) and (2,4) require (1,4)

Answer: A. Transitivity means that whenever (a,b) and (b,c) are in R, the pair (a,c) must also be in R. The relation contains (1,2) and (2,4), so it must contain (1,4), but (1,4) is absent. Hence this is the failed requirement. Option B is wrong because transitivity from (1,3) and (3,4) would require (1,4), not (3,1). Option C uses (3,2), which is not in the stated relation; moreover, its proposed conclusion is already present but the premise is unavailable. Option D is unrelated: (4,4) alone does not require (4,1). Memory cue: match the second coordinate of the first pair with the first coordinate of the second pair, then connect the two outer elements.

Related tags

Partial-OrderTransitivityRelationsLogicTransitive RelationRelations And FunctionsMathematicsClass 12 Mcq

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