If \( A=\left[\begin{array}{cc}5 a & -b \\ 3 & 2\end{array}\right] ...
If \( A=\left[\begin{array}{cc}5 a & -b \\ 3 & 2\end{array}\right] \) and \( A \) adj \( A=A A^{\top} \), then \( 5 a+b \) is equal to
\( \mathrm{P} \)
(1) 5
(2) 4
(3) 13
(4) \( -1 \)
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