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

$ 5\, .......\, A$

List all the elements of the following sers :

$D = \{ x:x$ is a letter in the word $"\mathrm{LOYAL}" $ $\} $

Which of the following sets are finite or infinite.

The set of months of a year

Examine whether the following statements are true or false :

$\{ a\}  \in \{ a,b,c\} $

Which set is the subset of all given sets

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