Mathematics, 06.04.2020 02:17 nicolashernandez347

If a universal set contains 250 elements, n(A) = 80, n(B) = 120, and n(A ∩ B) = 30, find n(A ∪ B)'

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If a universal set contains 250 elements, n(A) = 80, n(B) = 120, and n(A ∩ B) = 30, find n(A ∪ B)'...