1.

The necessary and sufficient condition for a set B to be a subset of A is that

A. A ⋃ B = A
B. (A - B) ⋂ B = ϕ
C. (A ⋂ B) ⋃ B = ϕ
D. A ⋃ B = B
Answer» B. (A - B) ⋂ B = ϕ


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