Question: Let n 2 be an integer. Consider strings consisting of n digits. Determine the number of such strings, in which no two consecutive digits are

Let n 2 be an integer. Consider strings consisting of n digits.

Determine the number of such strings, in which no two consecutive digits are equal. Justify your answer.

Determine the number of such strings, in which there is at least one pair of consecutive digits that are equal. Justify your answer.

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