Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$10 \, .........\, A $
$10 \notin A$
Write the following as intervals :
$\{ x:x \in R,3\, \le \,x\, \le \,4\} $
Write down all the subsets of the following sets
$\emptyset $
Write the following sets in the set-builder form :
$\{ 2,4,6 \ldots \} $
Show that the set of letters needed to spell $"\mathrm{CATARACT}"$ and the set of letters needed to spell $"\mathrm{TRACT}"$ are equal.
$\{ 3,6,9,12\}$
