1. Consider passwords of length 10 made with A, B, C, D, E, 9, 8, 6 (Repetition is allowed) a) How many strings have at least one letter and at least one digit? b) How many strings have at most one digit? Repetition is allowed. c) How many strings, have no A's and have exactly 4B's such that the B's are not adjacent and the string starts with a B but does not end with B?

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