Os conjuntos A, B e C são tais que:
A ∩ C = B ∩ C = {1, 2}, A U B = {1, 2, 3} e A U C = {1, 2, 4}

Então:

a) 1 ∉ C
b) 1 ∉ B
c) 3 ∉ B
d) 4 ∉ C
e) n.d.a​
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