Question

how many 8-character passwords are there such that the characters are distinct letters (either upper or lower case), in increasing alphabetical order? (e.g., abf himnz)

Answer 1

If you treat upper- and lower-case differently , you have the following options:

26 upper-case letters

26 lower-case letters

10 digits

You can use any of the these 62 characters in any one of 8 positions, which gives you the following:

628=218,340,105,584,896  unique passwords. That’s over 200 TRILLION possibilities.

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