It took me by surprise to find that  choose(4,5) delivers
[1] NaN
Warning message:
NaNs produced in: choose(n, k)
If we look at choose(4,5) as the number of ways of choosing 
5 objects from 4 I would have expected 0 as result.
Furthermore dhyper(5,4,6,5) does deliver 0 and this essentially 
equivalent to choose(4,5)*choose(6,0)/choose(10,5).
                                                               
I use R  for Windows, Version 1.0.1  (April 14, 2000)
   --- D.Trenkler ---
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   Dr. Dietrich Trenkler        (dtrenkler at nts6.oec.uni-osnabrueck.de)      
   Statistik / Empirische Wirtschaftsforschung
   Universitaet Osnabrueck
   Rolandstrasse 8                                Phone: +49(0) 541-969-2753
   D-49069 Osnabrueck                          Fax  : +49(0) 541-969-2744
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