Question

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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  • CreatedNovember 19, 2015
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