For a certain computer program a password must be exactly 5
characters long. The first character...
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 company wants to impose a more secure password system for its
employees to use on...
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 consists of: • letters {a, A, 6, B,
...,2,Z}, • digits {0, 1,...,9),...
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...
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)
1- A particular automatic sprinkler system has two different
types of activation devices for each sprinkler...
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...