[Probability] There are 26 letters in English. 1) Can you tell me # of possible combinations of creating 3 letter words when we can use the each letter as many time as we want 2) And when we can use each letter only once?

Data Science Interview QuestionsCategory: Data Science[Probability] There are 26 letters in English. 1) Can you tell me # of possible combinations of creating 3 letter words when we can use the each letter as many time as we want 2) And when we can use each letter only once?
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