alleryStart learning →A, B ⊆ U satisfy A ∩ B = ∅ and A ∪ B = U. Which equality must hold?
AB = ∅
BB = A′
CB = A
DB = U
Answer & Solution
Correct answer: B. B = A′
B contains none of A and contains every element of U outside A, so B is the complement of A.
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