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[tex]\Large\boxed{\begin{array}{l}\rm A=\begin{vmatrix}\sf2\\\sf3\\\sf6\end{vmatrix}~~B=\begin{vmatrix}\sf1\\\sf2\\\sf4\end{vmatrix}~~C=\begin{vmatrix}\sf0\\\sf4\\\sf2\end{vmatrix}\end{array}}[/tex]
[tex]\Large\boxed{\begin{array}{l}\tt a)~\sf A+B=\begin{vmatrix}\sf2+1\\\sf3+2\\\sf6+4\end{vmatrix}=\begin{vmatrix}\sf3\\\sf5\\\sf10\end{vmatrix}\\\\\tt b)~\sf A+C=\begin{vmatrix}\sf2+0\\\sf3+4\\\sf6+2\end{vmatrix}=\begin{vmatrix}\sf2\\\sf7\\\sf8\end{vmatrix}\\\\\tt c)~\sf B+C=\begin{vmatrix}\sf1+0\\\sf2+4\\\sf4+2\end{vmatrix}=\begin{vmatrix}\sf1\\\sf6\\\sf6\end{vmatrix}\\\\\tt d)~\sf A+B+C=\begin{vmatrix}\sf2+1+0\\\sf3+2+4\\\sf6+4+2\end{vmatrix}=\begin{vmatrix}\sf3\\\sf9\\\sf12\end{vmatrix}\end{array}}[/tex]
