Write down all the subsets of the following sets

$\emptyset $

The number of non-empty subsets of the set $\{1, 2, 3, 4\}$ is

Which of the following are examples of the null set

$\{ x:x$ is a natural numbers, $x\, < \,5$ and $x\, > \,7\} $

Write the following sets in the set-builder form :

$\{ 1,4,9 \ldots 100\} $

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

$\varnothing \subset A$

Which of the following are sets ? Justify your answer.

The collection of questions in this chapter.