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Mathematics
Which of the following is a null set ?
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Q. Which of the following is a null set ?
Sets
A
$\{0\}$
B
$\{x: x>0$ or $x<0\}$
C
$\left\{x: x^2=4\right.$ or $\left.x=3\right\}$
D
$\left\{x: x^2+1=0, x \in R\right\}$
Solution:
Correct answer is (d) $\left\{x: x^2+1=0, x \in R\right\}$