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If (A={1,2,3,4,5}), how many equivalence relations have (1) and (2) in the same class but (3) not in that class?

Answer and explanation

Correct answer: (10)

Step 1: First treat (1) and (2) as one block. Step 2: Element (3) must not be in that block, while (4) and (5) may be placed freely. Step 3: Partitions with (1,2) together are (15), and those with (1,2,3) together are (5), so the answer is (15-5=10).

Related tags

RelationsEquivalencePartitionConditionIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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