If \( \mathrm{A}=\left[\begin{array}{ccc}1 & -2 & 1 \\ 2 & 1 & 3\end{array}\right] \) and \( \ma...

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If \( \mathrm{A}=\left[\begin{array}{ccc}1 & -2 & 1 \\ 2 & 1 & 3\end{array}\right] \) and \( \mathrm{B}=\left[\begin{array}{ll}2 & 1 \\ 3 & 2 \\ 1 & 1\end{array}\right] \), then \( (\mathrm{AB})^{\mathrm{T}}= \)
\( \mathrm{P} \)
(1) \( \left[\begin{array}{cc}-3 & -2 \\ 10 & 7\end{array}\right] \)
(2) \( \left[\begin{array}{cc}-3 & 10 \\ -2 & 7\end{array}\right] \)
(3) \( \left[\begin{array}{cc}-3 & 10 \\ 7 & -2\end{array}\right] \)
(4) \( \left[\begin{array}{cc}3 & 10 \\ 2 & 7\end{array}\right] \)
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