The number of ways of picking unordered outcomes from possibilities. Also known as the Binomial
Coefficient or Choice Number and read `` choose .''

where is a Factorial.

**References**

Conway, J. H. and Guy, R. K. ``Choice Numbers.'' In *The Book of Numbers.*
New York: Springer-Verlag, pp. 67-68, 1996.

Ruskey, F. ``Information on Combinations of a Set.'' http://sue.csc.uvic.ca/~cos/inf/comb/CombinationsInfo.html.

© 1996-9

1999-05-26