Ononot — Given the matrix A = \begin{pmatrix} 1 & 2 & 1 \\ 2 & 4 & 2

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Linear Systemsmedium

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Given the matrix $A = \begin{pmatrix} 1 & 2 & 1 \\ 2 & 4 & 2 \\ 0 & 1 & 3 \end{pmatrix}$ , what is its rank?