Ononot — For the matrix A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatr

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For the matrix $A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ , what is the rank after performing $R_2 \to R_2 - 3R_1$ ?