For matrix $A$, we multiply each element by 3, and for matrix $B$, we multiply each element by 4. This gives us:
$3A = 3 \times \left[\begin{array}{ccc}2 & 3 & 1 \\ 0 & -1 & 5\end{array}\right] = \left[\begin{array}{ccc}6 & 9 & 3 \\ 0 & -3 &
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