State which of the following sets are finite or infinite :

$\{ x:x \in N$ and $x$ is odd $\} $

Decide, among the following sets, which sets are subsets of one and another:

$A = \{ x:x \in R$ and $x$ satisfy ${x^2} - 8x + 12 = 0 \} ,$

$B=\{2,4,6\}, C=\{2,4,6,8 \ldots\}, D=\{6\}$

Which of the following is the empty set

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

The set of circles passing through the origin $(0,0)$

Write the following as intervals :

$\{ x:x \in R,0\, \le \,x\, < \,7\} $

List all the elements of the following sers :

$B = \{ x:x$ is an integer $; - \frac{1}{2} < n < \frac{9}{2}\} $