Answer
$2, 3, 4$
Work Step by Step
A right triangle has the following property: $a^2$ + $b^2$ = $c^2$ where $a$ and $b$ are the two shortest sides of the triangle (and $c$ is the hypotenuse of the triangle).
$2^2+3^2 \ne 4^2$
$4 + 9 \ne 16$