Write the following sets in roster form :
$\mathrm{F} =$ The set of all letters in the word $\mathrm{BETTER}$
$F =$ The set of all letters in the word $BETTER$
There are $6$ letters in the word $BETTER,$ out of which letters $E$ and $T$ are repeated.
Therefore, this set can be written in roster form as
$F=\{B, E, T, R\}$
Write down all the subsets of the following sets
$\{ a,b\} $
What universal set $(s)$ would you propose for each of the following :
The set of isosceles triangles
Let $A=\{a, e, i, o, u\}$ and $B=\{a, i, u\} .$ Show that $A \cup B=A$
Write the following as intervals :
$\{ x:x \in R,0\, \le \,x\, < \,7\} $
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$