Answer
False
Work Step by Step
Let's analyse these matrices to see whether the statement is true.
$A=\begin{bmatrix}
1 & 1 & 2\\
0 & 1 & 2\\
3 & 2 & 1
\end{bmatrix} \rightarrow M_{11}=2$
$2A=\begin{bmatrix}
2 & 2 & 4\\
0 & 2 & 4\\
6 & 4 & 2
\end{bmatrix} \rightarrow M_{11}=8 \ne 4$
Hence, the statement is false.
