Compute the products \( A B \) and \( B A \) whichever exists in ea...

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Compute the products \( A B \) and \( B A \) whichever exists in each of the following cases:
\[
A=\left[\begin{array}{llll}
1 & -1 & 2 & 3
\end{array}\right] \text { and } B=\left[\begin{array}{l}
0 \\
1 \\
3 \\
2
\end{array}\right] \text {. }
\]
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