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Question 8 [10 marks] How many alphanumeric strings (strings containing letters or numbers) of length n start with a letter and contain at least one

Question 8 [10 marks] How many alphanumeric strings (strings containing letters or numbers) of length n start with a letter and contain at least one number? For example, A1010, B10BB are valid; 1010BB, CDEF are not. Prove your result.

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