$A = \{ x:x \ne x\} $ represents
$\{0\}$
$\{\}$
$\{1\}$
$\{x\}$
Which of the following are sets ? Justify your answer.
A collection of novels written by the writer Munshi Prem Chand.
Examine whether the following statements are true or false :
$\{a\} \subset\{a, b, c\}$
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{\varnothing\} \subset A$
List all the elements of the following sers :
$E = \{ x:x$ is a month of a year not having $ 31 $ days ${\rm{ }}\} $
Which of the following are sets ? Justify your answer.
The collection of all boys in your class.