Hi,
   
  I have used the function choose(n, k) sometimes, and i realized that it 
doesn't work properly for n < 0. For example, if one tries choose(-1, 3), it 
should be returned the value (-1)^3 = -1, since choose (-1, 3) = 
(-1)*(-2)*(-3)/3! = (-1)^3, but indeed R returns the value 0. I am using R 
version 2.5.1, it don't know if this little bug has already been solved in the 
new version. Thanks,
   
  Luis Ernesto.

       
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