Ononot — Calculate \det \begin{pmatrix} 1 & 0 & 0 & 0 \\ 2 & 3 & 0 &

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Determinantsmedium

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Calculate $\det \begin{pmatrix} 1 & 0 & 0 & 0 \\ 2 & 3 & 0 & 0 \\ 4 & 5 & 6 & 0 \\ 7 & 8 & 9 & 1 \end{pmatrix}$ .