6. Suppose that a password for a computer system must have at least 6, but no more than 9 characters, where each charact

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6 Suppose That A Password For A Computer System Must Have At Least 6 But No More Than 9 Characters Where Each Charact 1 (63.89 KiB) Viewed 70 times

6. Suppose that a password for a computer system must have at least 6, but no more than 9 characters, where each character in the password is a lowercase English letter, or an uppercase English letter, or a digit, or one of the five special characters *,<,>,!, and #. (a) How many different passwords are available for this computer system? (b) How many of these passwords contain at least one occurrence of at least one of the five special characters? (c) Using your answer to part (b), determine how long it takes a hacker to try ev- ery possible password, assuming that it takes one microsecond for a hacker to check each possible password.