1. S> A Set containing a certain number of objectSSelected from another Set. The number of combinationS of r objectS choSen from a Set of n iS n C r = n! / ((n-r)! r!) where "n C r" iS normally with n and r aSSubScriptS or aS n above r in parentheSeS. See alSo permutation. 2. In the theory of combinatorS, a combination denoteS an expreSSion in which function application iS the only operation. (1995-04-10)
