MCQOPTIONS
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| 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 | |