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On all subsets of (A={1,2,3,4}), (XRY) if and only if (|X|=|Y|). How many subsets are in the equivalence class of ({1,2})?

Answer and explanation

Correct answer: (6)

Step 1: The set ({1,2}) has (2) elements. Step 2: Its equivalence class contains all subsets of (A) having exactly (2) elements. Step 3: The number of such subsets is (\binom{4}{2}=6), so order should not be counted.

Related tags

Power SetCardinalityEquivalence ClassCountingEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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