A computer password is required to be 9 characters long. How many passwords are possible if the password requires 3 letter(s) followed by 6 digits (numbers 0-9), where no repetition of any letter or digit is allowed? There are possible passwords.
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Since the password requires at least one letter followed by a digit, we can start by calculating the number of possible combinations for each position in the password. For the first position, we have 26 options (the number of letters in the alphabet). For the Show more…
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