Sets

goals
If $n(A)=4,n(B)=3,n(A\times B\times C)=24$, then $n(C)=$

Given $\mu =${$x / x$ is an integer, $x \in [-4,6]$},
$P' = \left\{-4, -3, 0, 1, 2, 4, 6\right\}$
$Q' = \left\{-3, -2, 1, 3, 6\right\}$
For each of the following sets, state with reasons with reasons whether it is a null set.
Given, universal set = {$x$ : $x \,\,\epsilon\,\, N$, $10 \leq x \leq 35$}, A = {$x \,\,\epsilon\,\,N$ : $x \leq 16$} and B = {$x$ : $x > 29$}. Find :
If $A = \{1, 2, 3, 4, 5\}, B = \{2, 4, 6, 8\}$ and $\{3,4,5,6\}$; verify :