Answer
$IV$ region
Work Step by Step
When we reverse the digits of $15$ we get $51$. This means that $15$ is not a palindromic number.
$15$ is not an even number.
A - the set of palindromic numbers
B - the set of even numbers
$15$ Belongs in neither A nor B; therefore, it belongs in the region that is outside of the circle for A as well as the circle for B: the $IV$ region.
