How many identification codes are possible by using 3 letters if no letter may be repeated?

13. How many identification code are possible by using letters if no letter may be repeated?
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how many 3- letter identification codes are possible if no letter is repeated? --------- Using the 26 letter alphabet: The 1st is 1 of 26 then 1 of 25 then 1 of 24 --> 26*25*24