MCQ
If $A=\{1,2,\{3,4\}\}$, which of the following is a correct statement?
- A$3 \in A$
- ✓$\{1\} \subset A$
- C$\{2\} \in A$
- D$1 \subseteq A$
✓
Answer
Correct option: B.
$\{1\} \subset A$
B
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