The number of proper subsets of the set $\{1, 2, 3\}$ is
$8$
$6$
$7$
$5$
Which of the following are sets ? Justify your answer.
The collection of all natural numbers less than $100 .$
Write the following sets in roster form :
$D = \{ x:x$ is a prime number which is divisor of $60\} $
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $2x - 1 = 0\} $
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\varnothing \in A$
Write the following sets in the set-builder form :
$\{ 1,4,9 \ldots 100\} $