The possible combinations and permutations of arranging twelve numbers (i.e., the 1-12 number list) are:
Possible combinations:
Without repetitions: 1
With repetitions: 1,352,078
Possible permutations:
Without repetitions: 479,001,600
With repetitions: 8,916,100,448,256
The number of possible combinations without repetitions C(n,r) equals one because the total number of objects n (twelve digits) equals our sample size r (the twelve digits we'll arrange). In other words, if n = r, then C(n,r) = 1. Read more