alleryStart learning →Every element of A lies in B, and B ⊆ U. Complements use U. Which statement must hold?
AB′ ⊆ A′
BA′ ⊆ B′
CB′ ⊆ A
DA′ ⊆ B
Answer & Solution
Correct answer: A. B′ ⊆ A′
An element outside B cannot belong to A, since A lies inside B; thus every element of B's complement belongs to A's complement.
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