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![\displaystyle M=\left[ {\begin{array}{*{20}{c}} 1 & 2 & 3 & 4 \\ 5 & 6 & 7 & 8 \\ 9 & {10} & {11} & {12} \\ {13} & {14} & {15} & {16} \end{array}} \right]](https://s0.wp.com/latex.php?latex=%5Cdisplaystyle+M%3D%5Cleft%5B+%7B%5Cbegin%7Barray%7D%7B%2A%7B20%7D%7Bc%7D%7D+1+%26+2+%26+3+%26+4+%5C%5C+5+%26+6+%26+7+%26+8+%5C%5C+9+%26+%7B10%7D+%26+%7B11%7D+%26+%7B12%7D+%5C%5C+%7B13%7D+%26+%7B14%7D+%26+%7B15%7D+%26+%7B16%7D+%5Cend%7Barray%7D%7D+%5Cright%5D&bg=ffffff&fg=000000&s=0&c=20201002)
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removing the $ signs at the start and end
latex \displaystyle M=\left[ {\begin{array}{*{20}{c}} 1 & 2 & 3 & 4 \\ 5 & 6 & 7 & 8 \\ 9 & {10} & {11} & {12} \\ {13} & {14} & {15} & {16} \end{array}} \right]
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