This is LaTeX code:

[latex]
 
 N={\left( \begin{array}{c}
 30 \\ 
 3 \\ 
 \end{array} \right) \cdot {\left( \begin{array}{c}
 27 \\ 
 3 \\ 
 \end{array} \right) \cdot {\left( \begin{array}{c}
 24 \\ 
 3 \\ 
 \end{array} \right)\cdot ......... \cdot {\left( \begin{array}{c}
 3 \\ 
 3 \\ 
 \end{array} \right) 
[/latex]