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3. Students are required to create 6-character long passwords to access the library. The letters must be from lowercase letters or digits. Each password must
3. Students are required to create 6-character long passwords to access the library. The letters must be from lowercase letters or digits. Each password must start with "a" or "b", it also must contain at most three lowercaseletters (including the first letter) and contains no repeated digits (letters can be repeated). How many valid passwords are there? You are required to show your work step-by-step. [10 marks]
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