Taking the set of natural numbers as the universal set, write down the complements of the following sets:

$\{ x:x$ is an even natural number $\} $

Taking the set of natural numbers as the universal set, write down the complements of the following sets:

$\{x: x+5=8\}$

Taking the set of natural numbers as the universal set, write down the complements of the following sets:

$\{ x:x$ is a perfect square $\} $

Draw appropriate Venn diagram for each of the following:

$(A \cup B)^{\prime}$

If $A$ and $B$ be any two sets, then $(A \cap B)'$ is equal to