Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:

$ 0\, ........\, A $

Write the following intervals in set-builder form :

$\left( {6,12} \right]$

List all the elements of the following sers :

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

Which of the following are examples of the null set

Set of even prime numbers

Which of the following are examples of the null set

$\{ y:y$ is a point common to any two parallellines $\} $

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

The set of numbers which are multiple of $5$