Ononot — Let M = \begin{pmatrix} A & B \\ C & D \end{pmatrix} be a 2n

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Determinantshard

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Let $M = \begin{pmatrix} A & B \\ C & D \end{pmatrix}$ be a $2n \times 2n$ matrix where $A, B, C, D$ are $n \times n$ real matrices. Which of the following conditions guarantees that $\det(M) = \det(AD - BC)$ ?