Three-letter suffix


A file can have a three-letter suffix (e.g. .txt, .doc).

a) How many different three-letter suffixes are there?

b) Suppose you randomly select a three-letter suffix. What is the probability that you get at least two letters that are the same?

c) Suppose you randomly select a three-letter suffix. What is the probability that you get at most two letters that are the same?

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Basic Statistics: Three-letter suffix
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