Q 1How many four-character passwords are possible if each of the first three charactersis either A, B, C, or D, and the last character is an even digit
The password is of 4 characters of which first 3 characters are either A, B, C or D and the last character is even digit (0,2,4,6,8).
Number of ways to arrange first 3 characters is
Number of ways to arrange last character is
The number of 4-charachter password is
Q 1How many four-character passwords are possible if each of the first three charactersis either A,...
Assume passwords are 10 characters long, and each character is either a lower case letter, upper case letter, or digit 0, . . . , 9. (a) How many possible passwords are there? (b) How many passwords are there with at least one upper case letter, and also never repeat a character? (c) How many passwords are the same written forwards and backwards?
Q - Which is larger, the number of four-character passwords where each character is adigit from 1 to 8, or the number of eight-character passwords where each characteris a letter from A to D.
many ways are there to select a three character password in such a way that two characters are upper case letters and the third character is a numerical if the first two characters could be either upper or lower sasf? digit? What if the many ways are there to select a three character password in such a way that two characters are upper case letters and the third character is a numerical if the first two characters could be either...
A password consists of three letters followed by a two-digit number. (a) How many passwords are possible if there are no restrictions? 1757600 (b) How many passwords are possible if none of the letters or digits can be repeated? (c) What is the probability of guessing the password in one trial if there are no restrictions? O A. 0.0000007123 O B. 0.0000005690 O C. 0.2 O D. 0.798816568
3. A computer system uses passwords that contain exactly eight characters, and each character is one of the 26 lowercase letter (a -z) or 26 uppercase letters (A - Z) or 10 integers (0-9). Let Ω denote the set of all possible passwords. Suppose that all passwords in Ω are equally likely. Determine the probability for each of the following: (a) Password contains all lowercase letters given that it contains only letters (b) Password contains at least 1 uppercase letter...
A computer system uses passwords that contain exactly 3 characters, and each character is 1 of the 3 lowercase letters (a, b, c) or 3 upper case letters (A, B, C) or the 5 odd digits (1, 3, 5, 7, 9). Let Ω denote the set of all possible passwords, and let A and B denote the events that consist of passwords with only letters or only integers, respectively. Determine the number of passwords for Ω. Report the exact number
A computer system uses passwords that contain exactly 3 characters, and each character is one of the 26 lowercase letters (a-z) or 26 uppercase letters (A-Z) or 10 integers (0-9). Let Ω denote the set of all possible passwords, and let and denote the events that consist of passwords with only letters or only integers, respectively Suppose that all passwords in 2 are equally likely. Determine the following probabilities. Round your answers to three decimal places (e.g. 98.765). (c) The...
A computer system uses passwords that contain exactly 4 characters, and each character is 1 of the 3 lowercase letters (a, b, c) or 3 upper case letters (A, B, C) or the 5 odd digits (1, 3, 5, 7, 9). Let Ω denote the set of all possible passwords, and let A and B denote the events that consist of passwords with only letters or only integers, respectively. Determine the probability that a password contains only numbers given that...
Question 3: a. A computer password is 6 characters long. A character can be either a digit or an uppercase English letter. A valid password must contain exactly one digit. How many valid passwords are there? (hint: you do not know the position of this one digit. It might be in the beginning or the end or the middle of the password. You may use the combination low to select the position of this digit and then assigno value to...
Suppose that passwords for an email provider: must be either 8 or 10 characters long are case-sensitive, can include digits, and can include any of 12 special characters cannot end in a special character must contain at least one capital letter, one digit, or one special character (can contain more than one, just must contain at least one) How many different passwords are possible? Show your work. Work on the back of this sheet and attach additional sheets as necessary....