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exercise 3 find the number of words aia2ag of length...

Question: exercise 3 find the number of words aia2ag of length...

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Exercise 3: Find the number of words aia2...ag of length 9 such that at least 4 consec- utive letters are the same? (in other terms, for each i є ți, . . . ,9), а,е {а,b,c, . . . , s), and there exists an integer 1 K j < 6 such that aj - aj +1-ajt2-aj+3)

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