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There are 195 3-letter permutations.
There are 9 * 8 * 7, or 504, three letter permutations that can be made from the letters in the work CLIPBOARD.
3x2x1=6 permutations.
10! permutations of the word "Arithmetic" may be made.
There are 8P5 = 8*7*6*5*4 = 6720