If \( A=\left[\begin{array}{lll}-1 & 2 & -5\end{array}\right] \) and \( B=\left[\begin{array}{r}...

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If \( A=\left[\begin{array}{lll}-1 & 2 & -5\end{array}\right] \) and \( B=\left[\begin{array}{r}2 \\ -1 \\ 7\end{array}\right] \), write the orders of \( A B \) and \( B A \).
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