Dados os conjuntos A = {1, 2, -1, 0, 4, 3, 5} e B = {-1, 4, 2, 0, 5, 7} assinale a afirmação verdadeira: a) A U B = {2, 4, 0, -1} 
b) A ∩ (B - A) = Ø 
c) A ∩ B = {-1, 4, 2, 0, 5, 7, 3} 
d) (A U B) ∩ A = {-1, 0} 
e) Nenhuma das respostas anteriores
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