The following problem refers to strings in A, B, ..., Z.

Mathematics
Tutor: None Selected Time limit: 1 Day

Jun 21st, 2015

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if the letter can't be repeat, then it is equivalent to fill up 3 spaces with 25 different letters, so the number of ways is then 3P25 = 25*24*23 = 13800 

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Jun 21st, 2015

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