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Answers (1)
U = 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 M= 2,4,6,8,10,12,14,16,18,20 N = 1,3,5,7,9,11,13,15,17,19 S = 10,11,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 n(U) = 30 n(N') = 20 n(N) +n(S) =10+21= 31
