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Linear Systemsmedium
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For the matrix A=(1234)A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}A=(13​24​), what is the rank after performing R2→R2−3R1R_2 \to R_2 - 3R_1R2​→R2​−3R1​?