Ononot — Compute \det(A) where A = \begin{pmatrix} 1 & 2 & 1 \\ 0 & 1

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Determinantsmedium

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Compute $\det(A)$ where $A = \begin{pmatrix} 1 & 2 & 1 \\ 0 & 1 & 2 \\ 2 & 1 & 1 \end{pmatrix}$ using cofactor expansion along the first column.