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There are 195 3-letter permutations.
4! Four factorial. 4 * 3 * 2 = 24 permutations ------------------------
120
"Permutations" do consider the order. If you want the order ignored, then you're looking for "combinations". 3-digit permutations, repetition allowed: 9 x 9 x 9 = 729 3-digit permutations, no repetition: 9 x 8 x 7 = 504 3-digit combinations, no repetition = 504/6 = 84.
5*4*3*2*1 = 120