Find the number of possible 4 letter sequences

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Reference no: EM131214006

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.

Reference no: EM131214006

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