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On the set of all subsets of (S={1,2,3,4}), (A R B) holds when (|A\cap{1,2}|=|B\cap{1,2}|). What is the size of the equivalence class of ({1,3})?

Answer and explanation

Correct answer: (8)

Step 1: ({1,3}\cap{1,2}={1}), so the count is (1). Step 2: Choose exactly one element from ({1,2}) in (2) ways and any subset of ({3,4}) in (4) ways. Step 3: The class size is (2\cdot4=8).

Related tags

SubsetsIntersection CardinalityEquivalence ClassEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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