questão 1: considerando que A U B= {1,2,3,4,5,6,7,8}, A ∩ B= {4, 5} e A - B = {1,2,3}, assinale o conjunto B.
a) B={1,2,3,4,5,6,7}
b) B={4,5,6,7,8}
c)B={1,2,3}
d)B={4,5}
e)B={1,3,5,7}
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