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b. {1,2,3,9,12,14,15}
=({1,2,3,4,5,6,7} u {5,6,7,8,11,13}) n {4,5,6,8,10}
={1,2,3,4,5,6,7,8,11,13} n {4,5,6,8,10}
={4,5,6,8}
maaf ya kalo bisa jawabnya cuman bagian a