1. Permutation and Combination data _null_; n = 5; r = 2; *the factorial of a number; fact=fact(n); *for positive integers, fact(n) = gamma(n+1); gamm=gamma(n + 1); *C(n,r): number of combinations of n objects selected r ; *n! / [r!(n-r)!]; comb1 = comb(n,r); comb2 = […]