Question

If $A=(\begin{array}{cccc}1& -1& 3& 2\\ 5& -4& 7& 4\\ 6& 0& 9& 8\end{array})$, In which row and column does the element 7 occur?

Answer 1

$A=\left[\begin{array}{ccc}1& -1& 3\\ 5& -4& 7\\ 6& 0& 9\end{array}\begin{array}{c}2\\ 4\\ 8\end{array}\right]$

$\Rightarrow$ Position of element $7$ is $=a_{23}$

i.e, row $=2nd,$ column $=3rd.$

Hence, solved.