List all the elements of the following sers :
$A = \{ x:x$ is an odd natural number $\} $
Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:
$\{ x:x$ is a student of class $\mathrm{XI}$ of your school $\} \ldots \{ x:x$ student of your school $\} $
Write the following sets in the set-builder form :
$\{ 1,4,9 \ldots 100\} $
Which of the following are sets ? Justify your answer.
The collection of all even integers.
If $Q = \left\{ {x:x = {1 \over y},\,{\rm{where \,\,}}y \in N} \right\}$, then