Write down all the subsets of the following sets
$\emptyset $
The number of elements in the set $\{x \in R :(|x|-3)|x+4|=6\}$ is equal to
Consider the sets
$\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$
Insert the symbol $\subset$ or $ \not\subset $ between each of the following pair of sets:
$\phi \,....\,B$
Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:
$\{ x:x$ is an equilateral triangle in a plane $\} \ldots \{ x:x$ is a triangle in the same plane $\} $
The number of non-empty subsets of the set $\{1, 2, 3, 4\}$ is