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S = {Bilangan asli kurang dari 16}
S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
A = {Bilangan yang habis dibagi 3 yang kurang dari 20}
A = {3, 6, 9, 12, 15, 18}
B = {Bilangan ganjil kurang dari 18, lebih dari 8}
B = {9 , 11, 13, 15, 17}
Jawab:
A ∩ B ={ 9, 15 } (D)