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On (A={1,2,3,4,5,6}), how many equivalence relations have two classes both of size (3)?

Answer and explanation

Correct answer: (10)

Step 1: A three-element class can be chosen in (\binom{6}{3}=20) ways. Step 2: The remaining three elements automatically form the other class. Step 3: Since interchanging the two classes does not create a new partition, the count is (\frac{20}{2}=10).

Related tags

RelationsEquivalencePartitionClass-SizeIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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