The number of elements in the set $\{x \in R :(|x|-3)|x+4|=6\}$ is equal to
$3$
$2$
$4$
$1$
The smallest set $A$ such that $A \cup \{1, 2\} = \{1, 2, 3, 5, 9\}$ is
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{1,2,5\}\subset A$
If a set $A$ has $n$ elements, then the total number of subsets of $A$ is
Write down all the subsets of the following sets
$\{ 1,2,3\} $
Write the following sets in roster form :
$\mathrm{F} =$ The set of all letters in the word $\mathrm{BETTER}$