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
$E =\{ T , R , I , G , O , N , M , E , Y \}$
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{1,2,5\}\subset A$
List all the elements of the following sers :
$C = \{ x:x$ is an integer ${\rm{; }}{x^2} \le 4\} $
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$1 \subset A$
Which set is the subset of all given sets
Which of the following are sets ? Justify your answer.
A collection of most dangerous animals of the world.