Question: The following problems refer to strings in A, B, ..., Z. How many different four-letter strings are there? How many four-letter strings are there that

The following problems refer to strings in A, B, ..., Z. How many different four-letter strings are there? How many four-letter strings are there that begin with X? How many four-letter strings are there that contain exactly two X's? (Hint: Consider the disjoint cases determined by where the X's are in the string.)

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