Given $n(U) = 20$, $n(A) = 12$, $n(B) = 9$, $n(A \cap B) = 4$, where $U$ is the universal set, $A$ and $B$ are subsets of $U$, then $n({(A \cup B)^C}) = $

- A
$17$

- B
$9$

- C
$11$

- D
$3$

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

$\{ x:x \in N$ and $2x + 1\, > \,10\} $

If $A$ is any set, then

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

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

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

Draw appropriate Venn diagram for each of the following:

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