Write the set $\left\{\frac{1}{2}, \frac{2}{3}, \frac{3}{4}, \frac{4}{5}, \frac{5}{6}, \frac{6}{7}\right\}$ in the set-builder form.
Write the solution set of the equation ${x^2} + x - 2 = 0$ in roster form.
Examine whether the following statements are true or false :
$\{ x:x$ is an even natural number less than $6\} \subset \{ x:x$ is a natural mumber which divide $36\} $
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$
Write down all the subsets of the following sets
$\emptyset $