Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{\varnothing\} \subset A$
Examine whether the following statements are true or false :
$\{ a\} \in \{ a,b,c\} $
Write the following sets in roster form :
$D = \{ x:x$ is a prime number which is divisor of $60\} $
Write the following intervals in set-builder form :
$\left( { - 3,0} \right)$
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:
$A \ldots C$