Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$10 \, .........\, A $
$10 \notin A$
In the following state whether $A=B$ or not :
$A=\{4,8,12,16\} ; B=\{8,4,16,18\}$
Write the following intervals in set-builder form :
$\left( {6,12} \right]$
Write the following sets in the set-builder form :
$\{ 1,4,9 \ldots 100\} $
Show that the set of letters needed to spell $"\mathrm{CATARACT}"$ and the set of letters needed to spell $"\mathrm{TRACT}"$ are equal.
State whether each of the following set is finite or infinite :
The set of lines which are parallel to the $x\,-$ axis
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