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= {3, 4}
b. (A ∩ B) ∩ C = {3, 4} ∩ {2, 3, 4, 6, 7}
= {3, 4}
c. Tentukan B ∩ C terlebih dahulu:
B ∩ C = {3, 4, 5, 6} ∩ {2, 3, 4, 6, 7}
= {3, 4, 6}
A ∩ (B ∩ C) = {1, 2, 3, 4} ∩ {3, 4, 6}
= {3, 4}
d. Terbukti bahwa (A ∩ B) ∩ C = A ∩ (B ∩ C). Sifat ini disebut sifat asosiatif pada himpunan.