Question

Minor $m_{33}$ of the determinant $\left|\begin{array}{ccc}2& 3& 5\\ 2& -1& 8\\ 1& 2& 4\end{array}\right|$ is

Answer 1

$m_{33}=$ minor of $a_{33}=\left|\begin{array}{cc}-1& 8\\ 2& 4\end{array}\right|=-1\ast 4-8\ast 2=-4-16=-20$