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Determinantsmedium
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For the matrix A=(213456789)A = \begin{pmatrix} 2 & 1 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{pmatrix}A=​247​158​369​​, the minor M23M_{23}M23​ (determinant of the submatrix obtained by deleting row 2, column 3) is det⁡(2178)=9\det\begin{pmatrix} 2 & 1 \\ 7 & 8 \end{pmatrix} = 9det(27​18​)=9. What is the cofactor C23C_{23}C23​?