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Space Space Space
ELEMENTARY

ALGEBRA

BASIC

CALCULUS

CAS

DATA

GRAPHING

MANUAL

MATRIX

NUMBER

PLOT

SCRIPTING

SPECIAL

SPECIAL POLYNOMIALS

STATISTICAL

TRIGONOMETRIC

VECTOR CALCULUS
  nCr(n, r)
Returns the number of unordered subsets of r elements out of a set of n elements

nCr(n,r) = n! / ((n-r)! * r!)


References
http://mathworld.wolfram.com/Combination.html
http://en.wikipedia.org/wiki/Combination

Related Functions
Factorial, nPr





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