Ononot — Find the rank of the matrix A = \begin{pmatrix} 1 & 1 & 0 \\

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Linear Systemshard

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Find the rank of the matrix $A = \begin{pmatrix} 1 & 1 & 0 \\ 0 & 1 & 1 \\ 1 & 2 & 1 \end{pmatrix}$ .