Write the solution set of the equation ${x^2} + x - 2 = 0$ in roster form.

Write the following sets in the set-builder form :

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

Write the following as intervals :

 $\{ x:x \in R, - 4\, < \,x\, \le \,6\} $

Write the following sets in roster form :

$B = \{ x:x$ is a natural number less than ${\rm{ }}6\} $

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:

$A \ldots C$

Which of the following are examples of the null set

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