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  3. a seqstring is a sequence of 18 letters(one of the

A seqstring is a sequence of 18 letters(one of the 26 lowercase letters a-z). How many seq...

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Advance Math

A seqstringis a sequence of 18 letters(one of the 26 lowercase letters a-z).How many seq strings are there where the number of letters betweenany two occurences of the same letter is at least2?

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