Examine whether the following statements are true or false :
$\{ 1,2,3\} \subset \{ 1,3,5\} $
Write the following sets in roster form :
$\mathrm{F} =$ The set of all letters in the word $\mathrm{BETTER}$
How many elements has $P(A),$ if $A=\varnothing ?$
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$
Which of the following are examples of the null set
Set of even prime numbers