State which of the following sets are finite or infinite :
$\{ x:x \in N$ and ${x^2} = 4\} $
Which of the following are sets ? Justify your answer.
A collection of novels written by the writer Munshi Prem Chand.
Which of the following are examples of the null set
Set of odd natural numbers divisible by $2$
Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$ 8\, .......\, A $
Write the following intervals in set-builder form :
$\left[ {6,12} \right]$