Ononot — What is \det\begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 1 & 2

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Determinantseasy

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What is $\det\begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 1 & 2 & 3 \end{pmatrix}$ ?