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n(A) = 7
n(B) = 5
n(A n B) = 3
n(A u B) = n(A) + n(B) - n(A n B)
n(A u B) = 7+5-3 = 9
n(A u B)' = n(S) - n(A u B)
n(A u B)' = 10-9 = 1