This is pdfeTeX, Version 3.141592-1.20a-2.2 (Web2C 7.5.3) (format=pdflatex 2005.6.14)  16 JUN 2005 16:20
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**ch3.tex
(./ch3.tex
LaTeX2e <2003/12/01>
Babel <v3.8d> and hyphenation patterns for american, french, german, ngerman, d
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! Undefined control sequence.
l.3 \chapter
            {Combinatorics}\label{chp 3}
? 
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l.3 \chapter
            {Combinatorics}\label{chp 3}
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