Consider the sets

$\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$

Insert the symbol $\subset$ or $ \not\subset $ between each of the following pair of sets:

$A, \ldots B$

State which of the following sets are finite or infinite :

$\{ x:x \in N$ and ${x^2} = 4\} $

Which of the following sets are finite or infinite.

The set of positive integers greater than $100$

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

$\varnothing \in A$

Which of the following are sets ? Justify your answer.

The collection of questions in this chapter.

List all the elements of the following sers :

$A = \{ x:x$ is an odd natural number $\} $