Examine whether the following statements are true or false :
$\{ a\} \in \{ a,b,c\} $
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$
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 $\} $
Which of the following sets are finite or infinite.
$\{1,2,3 \ldots .\}$
List all the subsets of the set $\{-1,0,1\}.$