Question: 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,

How many alphanumeric strings (strings containing letters or numbers) of length

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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