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How many strings of five uppercase English letters are there (a) that start with the letters...

How many strings of five uppercase English letters are there
(a) that start with the letters BO (in that order), if letters can be repeated?

(b) if letters can be repeated?

(c) that start and end with the letters BO (in that order), if letters can be repeated?

(d) that start or end with the letters BO (in the order), if letters can be repeated? (inclusive or)

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