Calculate det(1000230045607891)\det \begin{pmatrix} 1 & 0 & 0 & 0 \\ 2 & 3 & 0 & 0 \\ 4 & 5 & 6 & 0 \\ 7 & 8 & 9 & 1 \end{pmatrix}det1247035800690001.
18
1
21
162