MCQ
For two sets $\text{A}\cap\text{B = A}$ iff:
- ✓$\text{B}\subseteq\text{A}$
- B$\text{A}\subseteq\text{B}$
- C$\text{A}\not=\text{B}$
- D$\text{A}=\text{B}.$
✓
Answer
Correct option: A.
$\text{B}\subseteq\text{A}$
The union of two sets is a set of all those elements that belong to A or to B or to both A and B.
If $\text{A}\cup\text{B = A},$ then $\text{B}\subseteq\text{A}.$
If $\text{A}\cup\text{B = A},$ then $\text{B}\subseteq\text{A}.$
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