Write the following sets in roster form :

$D = \{ x:x$ is a prime number which is divisor of $60\} $

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

$\{1,2,3\}\subset A$

Which of the following pairs of sets are equal ? Justify your answer.

$\mathrm{X} ,$ the set of letters in $“\mathrm{ALLOY}"$ and $\mathrm{B} ,$ the set of letters in $“\mathrm{LOYAL}”.$

State which of the following sets are finite or infinite :

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

List all the elements of the following sers :

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