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For the relation on A={1,2,3,4} whose equivalence classes are {1,2} and {3,4}, which pair is definitely absent?

Answer and explanation

Correct answer: (1,3)

Answer: C, (1,3). In an equivalence relation, two elements are related exactly when they belong to the same equivalence class. The classes here are {1,2} and {3,4}. Thus all ordered pairs whose two entries come from {1,2} are present, including (1,2) and (2,1). Similarly, both entries of (4,3) lie in {3,4}, so (4,3) must be present. However, 1 belongs to the first class and 3 belongs to the second class, so (1,3) joins different classes and is definitely absent. Option C is therefore the only correct choice. Memory cue: equivalence classes create complete blocks inside the relation, with no cross-block pairs.

Related tags

Equivalence-ClassesRelationsPartitionPairsEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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