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

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Determinantsmedium

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Compute $\det(C)$ for $C = \begin{pmatrix} 2 & 1 & 0 \\ 1 & 0 & 3 \\ 0 & -1 & 1 \end{pmatrix}$ using cofactor expansion.