حلو السوالف
02-04-2007, 04:06 PM
For a particular system, computer passwords consist of exactly eight characters.
(a) How many different passwords are possible if each character may be any lowercase letter (a through z) or digit?
(b) How many different passwords are possible if each character may be any lowercase letter or digit, and at least one character must be a digit?
(c) The system administrator for this system insists that passwords contain at least one digit, what is the probability that a valid password will be generated in this way?
(a) How many different passwords are possible if each character may be any lowercase letter (a through z) or digit?
(b) How many different passwords are possible if each character may be any lowercase letter or digit, and at least one character must be a digit?
(c) The system administrator for this system insists that passwords contain at least one digit, what is the probability that a valid password will be generated in this way?