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\text{If } A = \begin{bmatrix} 2 & -1 \\ 0 & 3 \end{bmatrix}, \text{ then } 3A = ?
\begin{bmatrix} 6 & -3 \\ 0 & 12 \end{bmatrix}
\begin{bmatrix} 6 & -3 \\ 0 & 3 \end{bmatrix}
\begin{bmatrix} 6 & -3 \\ 0 & 1 \end{bmatrix}
\begin{bmatrix} 6 & -3 \\ 0 & 9 \end{bmatrix}
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