Find the number of possible 4-letter sequences words where


For an alphabet consisting of 26 characters, find the following:

(a) The number of possible 4-letter sequences (words) where the same letter can appear in the word more than once.

(b) The number of possible 4-letter sequences (words) where the same letter cannot appear in the word more than once.

(c) The number of different ways the 26 letters can be ordered.

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Basic Statistics: Find the number of possible 4-letter sequences words where
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