Solve using matlab please!

For matrix A $=\{\begin{array}{ccc}\text{:}[3,& 4,& 1]\\ 8,& 5,& 7\\ 1,& 6,& 3\end{array}$

a$)$ Calculate its inverse $A^{-1}.$ If the summation of diagonal elements of $A^{-1}$ is $S,$ calculate $S$ and fill value $S$ in the blank.

$S=$

$$ A

b$)$ Calculate the determent of A$,$ and fill your answer in the blank.

Determent of $A$ is:

$$ A