Ononot — For the matrix \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 &

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Linear Systemshard

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For the matrix $\begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{pmatrix}$ , what is the rank?