What is the minor M12M_{12}M12 of the matrix A=(123456789)A = \begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{pmatrix}A=147258369?
det(4679)=−6\det \begin{pmatrix} 4 & 6 \\ 7 & 9 \end{pmatrix} = -6det(4769)=−6
det(1379)=−12\det \begin{pmatrix} 1 & 3 \\ 7 & 9 \end{pmatrix} = -12det(1739)=−12
det(4578)=−3\det \begin{pmatrix} 4 & 5 \\ 7 & 8 \end{pmatrix} = -3det(4758)=−3
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