$A = \{ x:x \ne x\} $ represents
Which of the following are sets ? Justify your answer.
A collection of novels written by the writer Munshi Prem Chand.
In the following state whether $\mathrm{A = B}$ or not :
$A = \{ 2,4,6,8,10\} ;B = \{ x:x$ is positiveeven integer and $x\, \le \,10\} $
The number of elements in the set $\{x \in R :(|x|-3)|x+4|=6\}$ is equal to
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\varnothing \in A$