SOLUTION: how many distinct 10-letter alphabetic strings are there?

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Question 445059: how many distinct 10-letter alphabetic strings are there?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
With repeats:
26^10=1.4*10^14 ans.
Without repeats:
26*25*24*23*22*21*20*19*18*17=1.93*10^13 ans.