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a u b = 1, 2, 3, 4, 5, 7, 9 a u b n c = 2, 3, 5, 7
maaf ya hanya segitu yang dapat saya jawab :)
A - C ={ 1,4,7,11}
(A U B)n C ={2,3,5,7}
(A U C)'U (B U C)'= { 4,6,8,9,10,12,13,14,15}