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:

$B \ldots \cdot C$

Write the following sets in the set-builder form :

${\rm{\{ 5,25,125,625\} }}$

Which of the following are sets ? Justify your answer.

A collection of novels written by the writer Munshi Prem Chand.

Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:

$\{ 2,3,4\}  \ldots \{ 1,2,3,4,5\} $

Let $A, B,$ and $C$ be the sets such that $A \cup B=A \cup C$ and $A \cap B=A \cap C$. Show that $B = C$

List all the elements of the following sers :

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