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Determinantseasy
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For the matrix A=(123456789)A = \begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{pmatrix}A=​147​258​369​​, the minor M23M_{23}M23​ (determinant of the submatrix from deleting row 2 and column 3) equals 666. What is the cofactor C23C_{23}C23​?