juandesant, 1 month ago @brucelawson that’s all permutations you can do with 0 elements: just 1. (Happens to be the same number of permutations that you can do with 1 element.)
@brucelawson that’s all permutations you can do with 0 elements: just 1. (Happens to be the same number of permutations that you can do with 1 element.)