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

The set of letters in the English alphabet

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:

$A, \ldots B$

State which of the following sets are finite or infinite :

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

Write the set $\{ x:x$ is a positive integer and ${x^2} < 40\} $ in the roster form.

Examine whether the following statements are true or false :

$\{a\} \subset\{a, b, c\}$

State which of the following sets are finite or infinite :

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