(a) To log on to a certain computer account, the user must type in a 4-letter password. In such a password, no letter may be repeated, and only the lower case of a letter may be used. How many such 4-letter passwords are possible? (There are 26 letters in the alphabet.) (b) From the 12 albums released by a musician, the recording company wishes to release 9 in a boxed set. How many different boxed sets are possible?

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A: Given: you must use at least one 26 lower case letter from {a, b, . . . , z}, at least one 26 upper…

Q: 1)a) How many 3 digits passcodes are there if first digit must be a 1 or 2 ?   b) How many 3…

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A:

Q: At a certain company, passwords must be from 4-6 symbols long and composed from the 26 uppercase…

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Q: How many 3-letter codewords can be formed if: At least one of the letters is to be chosen from the…

A:

Q: How many five-letter passwords can be formed from the letters {A, B, J, K, X, Z} under the following…

A: From the provided information, The letters are {A, B, J, K, X, Z} Total letters = 6

Q: To use an automated teller machine at a certain bank, you must enter a 4-digit code, using the…

A: This is a type of permutation problem. We want to arrange 1-9 digits in  4 positions with repetition…

Q: Let us say that we are going to create eight letter passwords from a set of 23 letters (all of the…

A: There are 23 alphabets, 10 numerics and 5 symbols.

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Q: To use an automated teller machine at a certain bank, you must enter a 3-digit code, using the…

A:

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A:

Q: 4. How many 5 digit numbers can be formed if a) the digits 2-8 are available and there must be at…

A: 4. It is required to form 5 digit numbers under two different sets of conditions.

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A: There are 10 ducks and 6 geese.

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A: The number of total digits to choose in the lock are 10. The number of digits used to open the lock…

Q: (a) A pizza parlor has a choice of 12 toppings for its pizzas. From these 12 toppings, how many…

A: a)GivenNo.of toppings for pizza=12

Q: How many different passwords are there that contain only digits and lower-case letters and satisfy…

A:

Q: 1. Frankie has to create a new Virginia Tech password. Suppose Frankie wants his password to be 7-9…

A: The given data is:

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A: To find-  Possible 6 digit codes if repetition of digits are permitted.

Q: A mail man has special -delivery for 10 customers. (i) In how many ways can he deliver to all? ii)…

A: i) deliver to all means arranging 10 customers in  all ways possible Total number of ways = 10! =…

Q: small combination on a suit case has 5 wheels, each labeld with 10 digits 0 to 9. How many 5 digit…

A: Given data, A small combination on a suit case has 5 wheels, each labeled with 10 digits 0 to 9.…

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Q: here are  14  European cities that Keiko would eventually like to visit. On her next vacation,…

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Q: To use an automated teller machine at a certain bank, you must enter a 4-digit code, using the…

A: Total available numbers = 9 To make 4 digit code

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A:

Q: Current rules for telephone area codes allow the use of digits​ 2-9 for the first​ digit, and​ 0-9…

A: Given data current rules for telephone area codes allow the use of digits 2-9 for the first digit…

Q: An Internet service provider requires its customers to select a password consisting of fourletters…

A: An Internet service provider requires its customers to select a password consisting of fourletters…

Q: 2) A school district assigns each of their students a password that consists of three unique letters…

A: Solution

Q: A TV game show selects four contestants from an audience of 26 people. If the same 26 people showed…

A: Given: Total number of people=26Number of people selected=4 The permutation formula is applied when…

Q: 6 - How many different two-letter passwords can be formed using the letters A, B, C, D, E, and F if…

A: given letters A B C D E F total no. of letters = 6 we need a two letter password

Q: a) How many ways are there to do this?

A: nCr=n!r!(n-r)!

Q: License plates in a particular state are to consist of 3 digits followed by 2 uppercase letters. How…

A: no.of digits=10  (0 to 10)no.of uppercase letters=26   (A to Z) 9 ways fill it (0 , 2, 3...10) 9…

Q: At a certain company, passwords must be from 4–6 symbols long and composed from the 26 uppercase…

A: Given, At a certain company, passwords must be from 4–6 symbols long and composed from the 26…

Q: How many different three-letter passwords can be formed from the letters A, B, C, D, E, and F if no…

A: There are 6 letters: A, B, C, D, E, and F Different three-letter passwords have to be formed from…

Q: Non-personalized California license plates start with a nonzero digit (1-9) followed by three…

A: Total number of digits = 1 to 9 =9Total number of digits = 0 to 9 =10Total letters = 26

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Q: How many strings of five uppercase English letters are there (a) that start with an X, if letters…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: 1. Suppose in a university, each subject offered to students has a subject code consisting of three…

A:

Q: To use an automated teller machine at a certain bank, you must enter a 5-digit code, using the…

A: To use an automated teller machine at a certain bank, we have to enter a 5 digit code using digits…

Q: 2. A combination lock has 4 wheels, each labeled with the 10 digits from 0 to 9. (a) How many 4…

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Q: 2. a) How many ways can a psychology student select 5 subjects from a pool of 20 subjects and assign…

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Q: 1. How many 4-letter passwords can be formed using the letters in the word "HONESTY" if the 4-letter…

A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 3. To login to a particular phone app, users must create a 6-character password using only the…

A: We have 10 digits available