Show that \( A B \neq B A \) in each of the following cases: \[ A=\...

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Show that \( A B \neq B A \) in each of the following cases:
\[
A=\left[\begin{array}{rrr}
-1 & 1 & 0 \\
0 & -1 & 1 \\
2 & 3 & 4
\end{array}\right] \text { and } B=\left[\begin{array}{lll}
1 & 2 & 3 \\
0 & 1 & 0 \\
1 & 1 & 0
\end{array}\right] \text { - }
\]
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