Fill in the blanks to make each of the following a true statement:
$A \cup A^{\prime} = \ldots$

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

If $A$ is any set,then:

Let $U = \{1, 2, 3, 4, 5, 6, 7, 8, 9\}$,$A = \{1, 2, 3, 4\}$,$B = \{2, 4, 6, 8\}$ and $C = \{3, 4, 5, 6\}$. Find $A^{\prime}$.

Fill in the blank to make the following a true statement:
$U^{\prime} \cap A = \ldots$

Consider the experiment of rolling a die. Let $A$ be the event 'getting a prime number' and $B$ be the event 'getting an odd number'. Write the set representing the event 'not $A$'.