# 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.

(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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