Question

A man needs a 4-letter password for a computer program. The letters A and U cannot be used, and two consecutive letters cannot be the same. How many passwords are possible if there is no difference between lowercase and uppercase?

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?

If you use a randomly chosen 4 character password (comprising
of all the lowercase, uppercase letters and digits 0 to 9), say
“Xp9m” how many maximum guesses are required by a computer to guess
this password? Compare the strength of this password with an 8
character password instead (say “Cm8Rz0pQ”) ? Show the simple math
that is underlying the calculation.
Do you agree with the statement “ An 8
letter password is around two times more secure than a 4...

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....

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?

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?

a password must be 4 characters long and contain only digits and
lowercase english letters. The english alphabet contains 5 vowels.
Assuming that digits and letters can be repeated how many differnt
passwords contain exactly one vowel?
enter the exact numeric 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.

Determine how many different computer passwords are possible if
(a) the digits and letters can be repeated, and (b) if the digits
and letters cannot be repeated.
i. 4 digits followed by 2 letters
ii. 5 digits followed by 1 letter.
iii. 3 digits followed by 3 letters

A computer password must be eight characters long. How many
passwords are possible if only the 26 letters of the alphabet are
allowed?
Assuming that repetitions of alphabets is possible to create
the password then the number of passwords possible
Assuming that repetitions of alphabets is not possible to
create the password then the number of passwords possible
A jar contains 4 red marbles numbered 1 to 4 and 10 blue
marbles numbered 1 to 10. A marble is drawn...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 11 minutes ago

asked 25 minutes ago

asked 46 minutes ago

asked 52 minutes ago

asked 54 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago