summaryrefslogtreecommitdiff
path: root/Master/texmf-doc/doc/english/guide-to-latex/exercises/chap7/exer7-16.tex
blob: e603633e6a606eeda4ff42a4e9dd6c1768d4f92f (plain)
1
2
3
4
5
6
7
8
9
10
11
\documentclass{article}
\begin{document}
\noindent
The total number of permutations of $n$ elements taken $m$ at a time
(symbol $V_n^m$) is
\vspace{-0.5ex}
\[ V_n^m = \prod_{i=0}^{m-1}(n-i) = 
  \underbrace{n(n-1)(n-2)\ldots(n-m+1)}_{\mbox{total of $m$ factors}} =
  \frac{n!}{(n-m)!} \]
\end{document}