List all the elements of the following sers :

$C = \{ x:x$ is an integer ${\rm{; }}{x^2} \le 4\} $

State whether each of the following set is finite or infinite :

The set of numbers which are multiple of $5$

Write the following as intervals :

 $\{ x:x \in R, – 4\, < \,x\, \le \,6\} $

Which of the following are sets ? Justify your answer.

The collection of questions in this chapter.

Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?

$\{1,2,5\}\in A$