Ononot — For which k is the matrix A = \begin{pmatrix} 1 & 1 & 1 \\ 1

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Determinantshard

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For which $k$ is the matrix $A = \begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 4 \\ 1 & 3 & k \end{pmatrix}$ singular?