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

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

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

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

$ 2 \, ....... \, A $

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:

$B \ldots \cdot C$

Which of the following sets are finite or infinite.

$\{1,2,3, \ldots 99,100\}$

State which of the following sets are finite or infinite :

$\{ x:x \in N$ and $2x - 1 = 0\} $