There's one (1) possible combination without repetitions and 300,540,195 combinations with repetitions of arranging a group of sixteen numbers (i.e., the 1-16 number list).
The possible combinations without repetitions C(n,r) is one because the total number of objects n (sixteen digits) equals our sample size r (the sixteen digits we'll arrange). In other words, C(n,r) = 1 because n = r.
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