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Mathematics, 07.04.2020 23:08 cooljazzy1234
Suppose a certain web site has you choose a username and a password where the username consists of 9 alphanumeric characters and the password is 8 alphanumeric characters the last of which must be numeric and the first of which must be alphabetical.
a. How many usernames are possible if they are not case sensitive?
b. How many passwords are possible if they are not case sensitive?
c. How many usernames are possible if they are case sensitive?
d. How many passwords are possible if they are case sensitive?
![ansver](/tpl/images/cats/User.png)
Answers: 1
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