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This question already has an answer here:

How can I make this matrix in LaTeX ?

enter image description here

My MWE :

$
\begin{bmatrix}
  x_{11} & . & .  & x_{1n} \\
 . & . & . & . \\
 . & . & . & . \\
 x_{m1} & . & .  & x_{mn}
\end{bmatrix}
$

I get this :

enter image description here

marked as duplicate by campa, Community Apr 19 '18 at 9:17

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