The number of proper subsets of the set $\{1, 2, 3\}$ is
Let $S=\{1,2,3, \ldots, 40)$ and let $A$ be a subset of $S$ such that no two elements in $A$ have their sum divisible by 5 . What is the maximum number of elements possible in $A$ ?
Which of the following are sets ? Justify your answer.
A collection of novels written by the writer Munshi Prem Chand.
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{ \{ 3,4\} \} \subset A$
Write the following sets in the set-builder form :
$\{ 2,4,6 \ldots \} $