Ononot — Compute \det\begin{pmatrix} 2 & 1 & 3 \\ 0 & 4 & 2 \\ 0 & 0

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Determinantseasy

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Compute $\det\begin{pmatrix} 2 & 1 & 3 \\ 0 & 4 & 2 \\ 0 & 0 & 5 \end{pmatrix}$ by expanding along the first column.