Question

Find Order of matrix : $\left[\begin{array}{ccc}1& 2& 6\\ 2& 4& 3\end{array}\right]$

Answer 1

Let $A=\left[\begin{array}{ccc}1& 2& 6\\ 2& 4& 3\\ & & \end{array}\right]$

$R_2\to R_2-2R_1$

$=\left[\begin{array}{ccc}1& 2& 6\\ 0& 0& -9\\ & & \end{array}\right]$

Since their are two non-zero rows therefore order of matrix $A$ is $2$