A database uses record identifiers that are alphanumeric strings in which the 10 decimal digits and...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A database uses record identifiers that are alphanumeric strings in which the 10 decimal digits and 26 upper-case letters are valid symbols. The criteria that define a valid record identifier are recursive. A valid record identifier of length n > 2 can be constructed in the following ways: beginning with any upper-case letter other than D and followed by any valid record identifier of length n – 1; beginning with 1C, 2K, or 7J and followed by any valid record identifier of length n - 2; or | • beginning with D and followed by any string of n – 1 decimal digits. Let r(n) denote the number of valid record identifiers of length n. We take r(0) = 1 and note that r(1) = 26. Find a recursion for r(n) when n > 2 and use it to compute r(5). A database uses record identifiers that are alphanumeric strings in which the 10 decimal digits and 26 upper-case letters are valid symbols. The criteria that define a valid record identifier are recursive. A valid record identifier of length n > 2 can be constructed in the following ways: beginning with any upper-case letter other than D and followed by any valid record identifier of length n – 1; beginning with 1C, 2K, or 7J and followed by any valid record identifier of length n - 2; or | • beginning with D and followed by any string of n – 1 decimal digits. Let r(n) denote the number of valid record identifiers of length n. We take r(0) = 1 and note that r(1) = 26. Find a recursion for r(n) when n > 2 and use it to compute r(5).
Expert Answer:
Related Book For
Elementary Statistics Picturing the World
ISBN: 978-0321911216
6th edition
Authors: Ron Larson, Betsy Farber
Posted Date:
Students also viewed these mathematics questions
-
A random right triangle can be constructed in the following manner. Let A be a random angle whose distribution is uniform on (0,Ï/2). For each X, construct a triangle as pictured below. Here, Y...
-
Find A+ and use it to compute the minimal length least squares solution to Ax = b.
-
Let R be an n n upper triangular matrix whose diagonal entries are all distinct. Let Rk denote the leading principal submatrix of R of order k and set U1 = (1). (a) Use the result from Exercise 11...
-
Under California Law, does a client Carmen Leake have an affirmative defense to inability to pay child support where a parent's inability to pay is due to unwillingness to work, if that parent is...
-
Define occupational fraud. Describe two common means of occupational fraud.
-
The following data represent the chemistry grades for a random sample of 12 freshmen at a certain college along with their scores on an intelligence test administered while they were still seniors in...
-
Two conspirators, Timothy Carpenter and Timothy Sanders, were charged with aiding and abetting a robbery affecting interstate commerce and the use or carriage of a firearm. At trial, the FBI...
-
One of the examples in this chapter dealt with determining the optimal reorder point for a computer monitor sold by Millennium Computer Corp. Suppose that it costs MCC $0.30 per day in holding costs...
-
What other options exist if you do not want to use the relational model? Researchon the Internet and find one other type of database model, describe that model, and post the link to the source that...
-
Consider the following fragment of assembly language that is to be executed on a generic three way superscalar processor that can accommodate one memory access per clock. Rewrite the code to improve...
-
For a newly established innovative firm with limited resources. What kind of market scope strategy they should be adopting and why? Justify your opinion.
-
Stock X price is $100 and could go up by 17% or down by 15% in each six-month period. A one-year put option on stock X has an exercise price of $98. The interest rate is 2.5% a year. Find an...
-
An aquarium display contains two fish from different species. Both fish can be modeled as cylinders. Fish 1 has a diameter of Do and a length of Lo. Fish 2 has a diameter of 4.Do and a length of...
-
For family estate planning in Canada, what helps to prevent your kids from wasting their inheritance due to her poor money management skills? Your response should include an explanation of two...
-
It has recently been estimated that the average American eats about 2 8 0 eggs per year. That comes out to nearly 1 0 0 million dozen eggs bought and sold per year. The graph below shows a...
-
a 4% loan of $20,000 is to be repaid by level annual installments. The principal on the 4th installment is $450. Find the amount of each installment
-
The minority() function takes three boolean arguments and returns true if at most one of its arguments is true; otherwise, it returns false. Complete two implementations of minority() by filling in...
-
You are planning to purchase your first home five years from today. The required down payment will be $50,000. You currently have $20,000. but you plan to contribute $500 each quarter to a special...
-
Repeat Exercise 20 for samples of size 30 and 45. What happens to the mean and the standard deviation of the distribution of sample means as the size of the sample increases? Exercise 20 The braking...
-
The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $12. Find the probability that a randomly selected utility bill is (a) Less than $70, (b)...
-
Refer to Exercise 21. Two more samples are taken, one from Spring and one from Austin. For 50 homes in Spring, x 1 = $124,329. For 50 homes in Austin, x 2 = $110,483. Use = 0.01. Do the new samples...
-
At a point \(P\) in a body, Cartesian stress components are given by \(\sigma_{x x}=80 \mathrm{MPa}, \sigma_{y y}=-40\) \(\mathrm{MPa}, \sigma_{z z}=-40 \mathrm{MPa}\), and \(\tau_{x y}=\tau_{y...
-
Find the principal stresses and the orientation of the principal axes of stresses for the following cases of plane stress. a. \(\sigma_{x x}=40 \mathrm{MPa}, \sigma_{y y}=0 \mathrm{MPa}, \tau_{x...
-
Determine the principal stresses and their associated directions, when the stress matrix at a point is given by 11 1 [6]=112 MPa. [121]
Study smarter with the SolutionInn App