Number of Elements A universal set U consists of 12 elements. If sets A, B, and C are proper subsets of U and n (U) = 12, n(A ∩B) = n (A ∩C) = n(B ∩C) = 6, n(A ∩B ∩C) = 4, and n(A ⋃B ⋃C) = 10, determine
a) n(A ⋃B)
b) n(A′ ⋃C)
c) n(A ∩B)′
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