Answer
$\overline{A\cap B}$ = $\{0,1,2,3,5,6,7,8,9\}$
Work Step by Step
In Exercise 11 we found: $A\cap B=\{4\}$
$\overline{A\cap B}$ is the set of elements of $U$, that are not in $A\cap B$.
Thus,
$\overline{A\cap B}$ = $\{0,1,2,3,5,6,7,8,9\}$
