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:
\[
A=\left[\begin{array}{rr}
5 & -1 \\
6 & 7
\end{array}\right] \text { and } B=\left[\begin{array}{ll}
2 & 1 \\
3 & 4
\end{array}\right]
\]
(W)
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