Mathematics, 14.09.2019 06:30 barisege4842
Your company requires user passwords that can be made up of combinations of 21 (no caps) letters and 10 numerals only, in any order. each valid password must be a string of these no more than 18 in length, but atleast 14 in length.
(a) how many different passwords are there?
(b) suppose now that each password must contain at least 15 numerals. now how many possible passwords are there now?
Answers: 3
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