If $$A = \left[ {\matrix{ {5a} & { - b} \cr 3 & 2 \cr } } \right]$ and $A$ adj $A=A$ ${A^T},$ then $5a+b$$ is equal to : - DASH

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Question

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

$4$

$13$

$-1$

$5$

Solution

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