Write down all the subsets of the following sets
$\{ 1,2,3\} $
Write the solution set of the equation ${x^2} + x - 2 = 0$ in roster form.
Which of the following are sets ? Justify your answer.
The collection of all boys in your class.
Two finite sets have $m$ and $n$ elements. The total number of subsets of the first set is $56$ more than the total number of subsets of the second set. The values of $m$ and $n$ are
List all the elements of the following sers :
$A = \{ x:x$ is an odd natural number $\} $