Ononot — Calculate \det \begin{pmatrix} 1 & 2 & 3 \\ 1 & 2 & 3 \\ 4 &

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Determinantshard

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