Ononot — Calculate the rank of \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 1

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Linear Systemseasy

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Calculate the rank of $\begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{pmatrix}$ .