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K = {1, 4, 7}
L = {7, 5, 1}
(H-K) n L = ...?
H - K = H n
= {1, 2, 3} n { 2, 3, 5}
= {2, 3}
(H - K) n L = (H n ) n L
= {2, 3} n { 7, 5, 1}
= { }
caranya=H-K=(2,3)IRISAN DARI L=Tidak ada/himpunan kosong