Question: User IDs on an old computer system consist of 4 letter sequences from the first 8 letters of the English alphabet: a, b, c,

User IDs on an old computer system consist of 4 letter sequences

User IDs on an old computer system consist of 4 letter sequences from the first 8 letters of the English alphabet: a, b, c, d, e, f, g, h. Note that the same letter can be used any number of times in the 4 letter sequence. When a new user first registers, an ID is randomly generated (all outcomes equally likely) with the only condition that it is different from the IDs of all previously registered users. (a) How many different IDs are possible for the first registered user? (b) How many different IDs are possible for the second registered user? (c) Jack, Kate and Sam are the only three users of this system. In how many different possible ways can they be assigned IDs?

Step by Step Solution

★★★★★

3.49 Rating (152 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

To solve this problem well tackle each part separately a How many different IDs are possible for the ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

In this mini-case, you will determine overall materiality as well as tolerable misstatement amounts for balance sheet accounts of EarthWear Clothiers, Inc. Most auditing firms use a simple approach...

How many different states are possible for an electron whose principle quantum number is n = 4? Write down the quantum numbers for each state?

How many conformational states are possible for a trimeric binding protein, whose three subunits each contain a ligand-binding site, when binding follows the (a) symmetry model or (b) the sequential...

you that In a normal distribution, x = 5 and z = 1.25. This tells (a) (10 points) x = 5 is (how many?) standard deviations (b) (10 points) to the (right or left?) of the mean.

Write a paper about Deaf Language Evolution and Developments

A creative engineer suggests structuring the TLB so that not all the bits of the presented address need match to result in a hit. Suggest how this might be achieved, and what might be the costs and...

\fThis is an electronic version of the print textbook. Due to electronic rights restrictions, some third party content may be suppressed. Editorial review has deemed that any suppressed content does...

Providing Quality School-Based Learning and Support Services 239 Chapter 6 Language and literacy support Your core task The core task of almost all TAs is to support students language and literacy...

Chapter 7 Revising and Presenting Your Writing I'm not a very good writer, but I'm an excellent rewriter. James A. Michener Half my life is an act of revision. John Irving Getting Started INT RODU CT...

Please help me make an Executive Summary. Explain what you will examine in the case study. Write an overview of the field you are researching. Make a thesis statement and sum up the results of your...

The historical demand for Peeps is shown in the table. A) Use a three-period simple moving average to forecast demand for July. What is the prognosis? B) Use exponential smoothing to forecast demand...

How is money laundering prevented?

Stock options have been called the pay program that built Silicon Valley Because of their key role as incentive pay for employees in high tech companies. They were popular during the 1 9 9 0 s , when...

Following are separate financial statements of Michael Company and Aaron Company as of December 31, 2013 (credit balances indicated by parentheses). Michael acquired all of Aarons outstanding voting...

An examination of the Prepaid Insurance account shows a balance of $10,280 at the end of an accounting period, before adjustment. Prepare journal entries to record the insurance expense for the...

The Eaton School District engaged in the following transactions during its scal year ending August 31, 2015. It established a purchasing department, which would be accounted for in a new internal...

The 2013 Intel Annual Report can be found at the following Web site: www.pearsonhighered.com/fraser. Using the annual report, answer the following questions: (a) Using the Intel Annual Report,...

Chypre, Inc., produces a cologne mist using a solvent mix (water and pure alcohol) and aromatic compounds (the scent base) that it sells to other companies for bottling and sale to consumers. Chypre...

Set up the Lagrangian, solve the consumers optimization problem and derive the labour supply curve. 5. (30 points) Consider a one-period closed economy model with government. The aggre- gate...

PA 4. Caesar Cipher Topics 1. Data Collections: Lists, Tuples, Arrays, Dictionaries, and Sets 2. Strings 3. Exceptions 4. Files 5. Functions Instructions (You Must Read Everything!!!) Caesar Cipher...

ttth Suppose that the sequence of bags {Bn | n N} is recursively enumerated by the computable function e(n, x) = fn(x), [7 marks] Hence prove that the set of all recursive bags cannot be recursively...

Lab 1 Understanding Public Key Encryption Preparation: Review textbook explanation on public key encryption, understanding this encryption method needs each user to have a pair of two keys (public...

can you please answers all multiple choice answers please. Core Concepts of Accounting Information Systems, 13th Edition, by Simkin, Rose, and Norman Chapter 6 DEVELOPING AND IMPLEMENTING EFFECTIVE...

Miller-Rabin test to check whether a number N is composite. This will involve computing a N1 mod N for some value of a. [10 marks] Carry out the steps for N = 65 and a = 1, 2, 8 and 12. on what each...

Write an engagement letter of no more than 1,050 words for a Section 404 audit of Apollo Shoes. Assume that Apollo Shoes is a publicly traded company for which the SEC requires an audit of internal...