\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Compute \(A B\) for \(A = \begin{pmatrix} 2 & 1 \\ 3 & -1 \end{pmatrix}\) and \(B = \begin{pmatrix} 1 & 2 \\ 0 & -3 \end{pmatrix}\).
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