![subject](/tpl/images/cats/mat.png)
Mathematics, 09.01.2020 01:31 starfox5454
9. to order books from an online site, the buyer must open an account. the buyer needs a username and a password.
a. if the username needs to be eight letters, how many different usernames are possible:
i. if the letters can be repeated?
ii. if the letters cannot be repeated?
b. if the password must be eight characters, which can be any of the 26 letters, 10 digits, and 12 special keyboard characters, how many passwords are possible:
i. if characters can be repeated?
ii. if characters cannot be repeated?
c. how would your answers to part (b) change if the password is case sensitive? (in other words, password and password are considered different because the letter p is in uppercase
and lowercase.)
![ansver](/tpl/images/cats/User.png)
Answers: 3
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![](/tpl/images/ask_question_mob.png)
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9. to order books from an online site, the buyer must open an account. the buyer needs a username an...
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