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Mathematics, 08.11.2019 03:31 monifaWilson

Find the number of elements in a1 ∪a2 ∪a3 if there are 100 elements in a1, 1000 in a2, and 10,000 in a3 if a) a1 ⊆ a2 and a2 ⊆ a3. b) the sets are pairwise disjoint. c) there are two elements common to each pair of sets and one element in all three sets.

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