The number of ways of picking unordered outcomes from possibilities. Also known as the Binomial
Coefficient or Choice Number and read `` choose .''
See also Binomial Coefficient, Derangement, Factorial, Permutation, Subfactorial
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.