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If only A has 21 elements, only B has 24, only C has 18, only A∩B has 13, only B∩C has 11, only C∩A has 9, and all three sets have 7 elements, how many elements belong to exactly two sets?
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SubjectsIf only A has 21 elements, only B has 24, only C has 18, only A∩B has 13, only B∩C has 11, only C∩A has 9, and all three sets have 7 elements, how many elements belong to exactly two sets?