1. The binomial coefficient (%) (pronounced "n choose m) counts the number of ways of choosing an (unordered) subset of k elements from a set of n elements. These numbers may be defined for integers n and m with 0 Sm Sn by the relationships 0-- and + for 0 n then return 0. 17 7/ choose (n.m) returns how many ways there are to choose m items from a set of n items // requires: 0