SOLUTION: how many 3- letter identification codes are possible if no letter is repeated?

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Question 591901: how many 3- letter identification codes are possible if no letter is repeated?
Answer by Alan3354(69443) About Me  (Show Source):
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how many 3- letter identification codes are possible if no letter is repeated?
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Using the 26 letter alphabet:
The 1st is 1 of 26
then 1 of 25
then 1 of 24
--> 26*25*24