List all the elements of the following sers :

$A = \{ x:x$ is an odd natural number $\} $

$A = \{ x:x \ne x\} $ represents

Examine whether the following statements are true or false :

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

Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?

$\{1,2,5\}\subset A$

Are the following pair of sets equal ? Give reasons.

$A = \{ 2,3\} ,\quad \,\,\,B = \{ x:x$ is solution of ${x^2} + 5x + 6 = 0\} $

Write the following sets in roster form :

$B = \{ x:x$ is a natural number less than ${\rm{ }}6\} $