Solve this following

Question:

If $\mathrm{A}=\left[\begin{array}{cc}5 \mathrm{a} & -\mathrm{b} \\ 3 & 2\end{array}\right]$ and $\mathrm{A}$ adj $\mathrm{A}=\mathrm{A} \mathrm{} \mathrm{A}^{\mathrm{T}}$, then $5 \mathrm{a}+\mathrm{b}$ is equal to :

  1. 13

  2. $-1$

  3. 5

  4. 4


Correct Option: , 3

Solution:

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