Ononot — For a 2 \times 2 matrix M = \begin{pmatrix} a & b \\ c & d \

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Determinantshard

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For a $2 \times 2$ matrix $M = \begin{pmatrix} a & b \\ c & d \end{pmatrix}$ , the minor $M_{12}$ (minor of element in row 1, column 2) equals: