Let $A=\{a, e, i, o, u\}$ and $B=\{a, b, c, d\} .$ Is $A$ a subset of $B ?$ No. (Why?). Is $B$ a subset of $A ?$ No. (Why?)
The smallest set $A$ such that $A \cup \{1, 2\} = \{1, 2, 3, 5, 9\}$ is
Which of the following are sets ? Justify your answer.
A team of eleven best-cricket batsmen of the world.
Write the set $\{ x:x$ is a positive integer and ${x^2} < 40\} $ in the roster form.
Write the following intervals in set-builder form :
$\left[ { - 23,5} \right)$