The adjoint of matrix \( A=\left[\begin{array}{cc}1 & -7 \\ 5 & 6\e...
The adjoint of matrix \( A=\left[\begin{array}{cc}1 & -7 \\ 5 & 6\end{array}\right] \) is
\( \mathrm{P} \)
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(1) \( \left[\begin{array}{cc}6 & 7 \\ -5 & 1\end{array}\right] \)
(2) \( \left[\begin{array}{cc}6 & -5 \\ 7 & 1\end{array}\right] \)
(3) \( \left[\begin{array}{ll}6 & 5 \\ 1 & 7\end{array}\right] \)
(4) \( \left[\begin{array}{ll}-6 & -5 \\ -1 & -7\end{array}\right] \)
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