List all the elements of the following sers :

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

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

$ 2 \, ……. \, A $

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

The set of lines which are parallel to the $x\,-$ axis

Examine whether the following statements are true or false :

$\{ a\}  \in \{ a,b,c\} $

State which of the following sets are finite or infinite :

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