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A computer password is required to be 7 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 5 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

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  1. Possible 2 letters: 26*25
    possible 5 digits : 10*9*8*7*6

    so possible passwords = 26*25*10*9*8*7*6
    = ....

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