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Set Theorymedium
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Consider three sets A,B,A, B,A,B, and CCC such that n(A)=10,n(B)=12,n(C)=15n(A)=10, n(B)=12, n(C)=15n(A)=10,n(B)=12,n(C)=15. If A∩B=∅A \cap B = \emptysetA∩B=∅ and C⊂(A∪B)C \subset (A \cup B)C⊂(A∪B), what is n(A∪B∪C)n(A \cup B \cup C)n(A∪B∪C)?