Let $A=\left[\begin{array}{ccc}1& 5& -1\\ 3& 1& 5\end{array}\right].$ Use MATLAB to find:

$($a$)AR$

$($b$)$ first column of $R)$

$($c$)($second row of $A)R$

$($d$)$ How do the answers in $($b$)$ and $($c$)$ relate to the answer in $($a$)?$

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Pls Provide code for MATLAB