Write down all the subsets of the following sets

$\{ a,b\} $

The set $A = \{ x:x \in R,\,{x^2} = 16$ and $2x = 6\} $ equals

Which set is the subset of all given sets

Given the sets $A=\{1,3,5\}, B=\{2,4,6\}$ and $C=\{0,2,4,6,8\},$ which of the following may be considered as universal set $(s)$ for all the three sets $A$, $B$ and $C$

$\varnothing$

Which of the following are sets ? Justify your answer.

The collection of all even integers.