Question

Each user on a computer system has a password, which is seven to
nine characters long, where each

character is an uppercase letter or a digit. Each password must
contain at least one digit or at

least one Uppercase letter. How many possible passwords are
there?

Answer #1

For a certain computer program a password must be exactly 5
characters long. The first character can be any lowercase letter,
the second must be an uppercase letter, the third character must be
a number from 0 – 9, the fourth character can either be a lowercase
letter or a number 0 - 9, the fifth character has to be exactly the
same as the first character.
(6)
How many possible passwords are there?
What is the...

Suppose that a certain computer password is allowed to be from 8
to 12 characters long, and may contain only lowercase letters (a to
z), uppercase letters (A to Z), and numbers (0 to 9).
1. How many such passwords are possible?
2. How many such passwords are possible if you cannot repeat
characters?
3. How many such passwords are possible if you cannot repeat
characters, and you must include
at least one number?

A computer password is required to be 6 characters long. How
many passwords are possible if the password requires 1 letter(s)
followed by 5 digits (numbers 0-9), where no repetition of any
letter or digit is allowed?
There are possible passwords.

A company wants to impose a more secure password system for its
employees to use on the company’s network. The current policy
requires a minimum of seven characters. The system under
consideration requires a minimum of eight characters. The new
system will allow repetition of characters, but not doubling (e.g.,
the sequence 121 would be acceptable, but not 112).
For both password systems, assume the following:
Only alphanumeric characters can be used in the passwords,
without any spaces or symbols....

A computer password can be 5 - 6 characters. The password must
contain at least 1 digit. All other characters must either be
digits or lower case letters. How many unique passwords exists?

1) Assume that a password can contain upper and lower-case
letters (26), digits, and special characters from the set { !, #,
$, %, &, * }. Furthermore, each password must start with a
letter and must contain at least one digit and one special
character. How many different six-character passwords can be formed
according to this specification?

A computer password consists of: • letters {a, A, 6, B,
...,2,Z}, • digits {0, 1,...,9), or = 16 • special characters
{!,@,#,$,%}. In addition, a password must • contain at least one
upper case letter, • contain at least one special character. How
many passwords of length 8 are possible?

The AccessPlus system at ISU has the following policy for
creating a password:
-Passwords must be exactly 8 characters in length.
-Passwords must include at least one letter (a-z, A-Z) or
supported special character (@, #, $ only).
-All letters are case-sensitive.
-Passwords must include at least one number (0-9).
-Passwords cannot contain spaces or unsupported special
characters.
According to this policy, how many possible AccessPlus passwords
are available? (Round to the nearest
trillion)

Using Python, generate a random password which meets these rules
and show five examples of the random passwords.
rules: password contains 6-20 characters, contain at least one
lowercase letter, at least one uppercase letter, and at least one
digit, must not contain three repeating characters in a row
("...aaa..." is weak, but "...aa...a..." is strong, assuming other
conditions are met).

1- A particular automatic sprinkler system has two different
types of activation devices for each sprinkler head. One type has a
reliability of 0.87; that is, the probability that it will activate
the sprinkler when it should is 0.87. The other type, which
operates independently of the first type, has a reliability of
0.77. If either device is triggered, the sprinkler will activate.
Suppose a fire starts near a sprinkler head.
a) What is the probability that the sprinkler head...

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