Question

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.

Answer #1

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...

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?

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 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?

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...

A computer system uses passwords that are exactly eight
characters and each character is one of the 26 letters (a-z) or
integers (0-9). Uppercases are not allowed).
How many passwords are possible?
If one selected a random password, what is the probability it
consists of five letters followed by 3 numbers?
What is the probability that a randomly selected password
consists exactly of 7 letters and 1 number?

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?

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

2) Allowing (or requiring) users to use numerical digits
(including 0) and one of 28 “special characters” dramatically
increases the number of possible passwords. Furthermore, passwords
often are case-sensitive, effectively doubling the size of the
alphabet by defining 52 distinct letter characters.
Assuming that passwords are case-sensitive and can include
numerical digits and special characters, how many possible 6, 8 and
10 character passwords can be created? (8 points)
3) Allowing digits and special characters creates an enormous
number...

How many passwords of 5 characters can be made if each password
must start with two digits and end with three letters. The digits
will be with replacement and the letters will be without
replacement.

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