Ononot — Find the determinant of M = \begin{pmatrix} 2 & 1 & 1 \\ 1 &

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Find the determinant of $M = \begin{pmatrix} 2 & 1 & 1 \\ 1 & 2 & 1 \\ 1 & 1 & 2 \end{pmatrix}$ by expanding along the first row using cofactors.