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Let \(\mathbf{A}\) and \(\mathbf{B}\) be invertible matrices such that \(\mathbf{A} \begin{pmatrix} 2 \\ -1 \end{pmatrix} = \begin{pmatrix} 1 \\ 2 \end{pmatrix} \text{ and } \mathbf{B} \begin{pmatrix} 1 \\ 3 \end{pmatrix} = \begin{pmatrix} 2 \\ -1 \end{pmatrix}.\)
Calculate \((\mathbf{A}\mathbf{B})^{-1} \begin{pmatrix} 1 \\ 2 \end{pmatrix}.\)

 Oct 13, 2019
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 Oct 13, 2019
edited by Rom  Oct 18, 2019

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