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

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Determinantseasy

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Evaluate $\det \begin{pmatrix} 1 & 2 & 3 \\ 0 & 1 & 4 \\ 0 & 0 & 2 \end{pmatrix}$ .