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An equivalence relation on (A={a,b,c,d}) has classes ({a,c}) and ({b,d}). How many ordered pairs are in this relation?

Answer and explanation

Correct answer: (8)

Step 1: In an equivalence relation, every element of a class is related to every element of the same class. Step 2: ({a,c}) contributes (2^2=4) pairs and ({b,d}) contributes (2^2=4) pairs. Step 3: The total is (4+4=8), with no cross-class pairs.

Related tags

PartitionCounting PairsEquivalence ClassesEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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