A computer password is required to be 5 characters long. How many passwords are possible if the password requires 1 letter(s) followed by 4 digits (numbers 0-9), where no repetition of any letter or digit is allowed? There are__________ possible passwords.
Added by Nicole S.
Step 1
For the second character, there are 10 choices (digits 0-9), but since no repetition is allowed, we have 9 choices left (we already used one digit for the first character). For the third character, there are 8 choices left (we already used two digits). For the Show more…
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