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:
\[
A=\left[\begin{array}{rr}
3 & 2 \\
-1 & 0 \\
-1 & 1
\end{array}\right] \text { and } B=\left[\begin{array}{ccc}
4 & 5 & 6 \\
0 & 1 & 2
\end{array}\right]
\]
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