The number of elements in the set $\{x \in R :(|x|-3)|x+4|=6\}$ is equal to
$3$
$2$
$4$
$1$
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$
Assume that $P(A)=P(B) .$ Show that $A=B$.
If $A = \{ 1,\,2,\,3,\,4,\,5\} ,$ then the number of proper subsets of $A$ is
In each of the following, determine whether the statement is true or false. If it is true, prove it. If it is false, give an example.
If $A \subset B$ and $B \in C,$ then $A \in C$
Write down all the subsets of the following sets
$\{ a,b\} $