MCQ
In set-builder method the null set is represented by:
- A$\{\}$
- B$\phi$
- ✓$\{\text{x : x} \not=\text{x}\}$
- D$\{\text{x : x} =\text{x}\}.$
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$I$. It has at least one negative root.
$II$. It has at least one positive root.
$III$. Both its roots are real.