Write the following sets in roster form :
$\mathrm{E} =$ The set of all letters in the world $\mathrm{TRIGONOMETRY}$
$E =$ The set of all letters in the word $TRIGONOMETRY$
There are $12$ letters in the word $TRIGONOMETRY,$ out of which letters $T,$ $R$ and $O$ are repeated
Therefore, this set can be written in roster form as
$E =\{ T , R , I , G , O , N , M , E , Y \}$
Which of the following is a true statement
How many elements has $P(A),$ if $A=\varnothing ?$
Write the following sets in roster form :
$B = \{ x:x$ is a natural number less than ${\rm{ }}6\} $
What universal set $(s)$ would you propose for each of the following :
The set of right triangles
Write the set $\{ x:x$ is a positive integer and ${x^2} < 40\} $ in the roster form.