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 the set $\{ x:x$ is a positive integer and ${x^2} < 40\} $ in the roster form.
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 $\} $
What universal set $(s)$ would you propose for each of the following :
The set of right triangles
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and ${x^2} = 4\} $
Consider the sets
$\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$
Insert the symbol $\subset$ or $ \not\subset $ between each of the following pair of sets:
$A \ldots C$