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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]
Windows 11 Installation Guides
by Dr Philip Yip (Dell Community Rockstar and Microsoft Windows Insider MVP)
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]