Ononot — For the matrix A = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 1 & 2 \\

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For the matrix $A = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 1 & 2 \\ 0 & 0 & 0 \end{pmatrix}$ in row echelon form, what is the dimension of the row space?