Introductory Combinatorics
5th Edition
ISBN: 9780136020400
Author: Richard A. Brualdi
Publisher: Prentice Hall
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Chapter 11, Problem 20E
To determine
To prove: A graphs of order n with at least
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Here is an augmented matrix for a system of equations (three equations and three variables). Let the
variables used be x, y, and z:
1 2 4 6
0 1
-1
3
0
0
1
4
Note: that this matrix is already in row echelon form.
Your goal is to use this row echelon form to revert back to the equations that this represents, and then to
ultimately solve the system of equations by finding x, y and z.
Input your answer as a coordinate point: (x,y,z) with no spaces.
1
3 -4
In the following matrix
perform the operation 2R1 + R2 → R2.
-2 -1
6
After you have completed this, what numeric value is in the a22 position?
5
-2
0
1
6 12
Let A
=
6
7
-1
and B =
1/2 3 -14
-2 0
4
4
4
0
Compute -3A+2B and call the resulting matrix R.
If rij represent the individual entries in the matrix R, what numeric value is in 131?
Input your answer as a numeric value only.
Chapter 11 Solutions
Introductory Combinatorics
Ch. 11 - Prob. 1ECh. 11 -
Determine each of the 11 nonisomorphic graphs of...Ch. 11 - Does there exist a graph of order 5 whose degree...Ch. 11 - Does there exist a graph of order 5 whose degree...Ch. 11 -
Use the pigeonhole principle to prove that f1...Ch. 11 - Let be a sequence of n nonnegative integers whose...Ch. 11 - Let G be a graph with degree sequence (d1, d2,...Ch. 11 - Draw a connected graph whose degree sequence...Ch. 11 - Prove that any two connected graphs of order n...Ch. 11 - Determine which pairs of the general graphs in...
Ch. 11 - Determine which pairs of the graphs in Figure...Ch. 11 - Prove that, if two vertices of a general graph are...Ch. 11 - Let x and y be vertices of a general graph, and...Ch. 11 - Let x and y be vertices of a general graph, and...Ch. 11 - Let G be a connected graph of order 6 with degree...Ch. 11 - Let γ be a trail joining vertices x and y in a...Ch. 11 - Let G be a general graph and let G' be the graph...Ch. 11 - Prove that a graph of order n with at least
edges...Ch. 11 - Prob. 21ECh. 11 - Prob. 26ECh. 11 - Prob. 27ECh. 11 - Determine if the multigraphs in Figure 11.41 have...Ch. 11 - Which complete graphs Kn have closed Eulerian...Ch. 11 - Determine all nonisomorphic graphs of order at...Ch. 11 - Solve the Chinese postman problem for the complete...Ch. 11 - Call a graph cubic if each vertex has degree equal...Ch. 11 - * Let G be a graph of order n having at...Ch. 11 - Let be an integer. Let Gn be the graph whose...Ch. 11 - Prove Theorem 11.3.4.
Ch. 11 - Which complete bipartite graphs Km, n have...Ch. 11 - Prove that Km,n is isomorphic to Kn,m.
Ch. 11 - Is GraphBuster a bipartite graph? If so, find a...Ch. 11 - Prob. 50ECh. 11 - Prob. 51ECh. 11 - Prob. 53ECh. 11 - Which trees have an Eulerian path?
Ch. 11 - Prob. 55ECh. 11 - Prob. 56ECh. 11 - Prob. 58ECh. 11 - Prove that the removal of an edge from a tree...Ch. 11 - Prob. 60ECh. 11 - Prob. 62ECh. 11 - Prob. 63ECh. 11 - Prob. 64ECh. 11 - How many cycles does a connected graph of order n...Ch. 11 - Prob. 68E
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- 1 -2 4 10 My goal is to put the matrix 5 -1 1 0 into row echelon form using Gaussian elimination. 3 -2 6 9 My next step is to manipulate this matrix using elementary row operations to get a 0 in the a21 position. Which of the following operations would be the appropriate elementary row operation to use to get a 0 in the a21 position? O (1/5)*R2 --> R2 ○ 2R1 + R2 --> R2 ○ 5R1+ R2 --> R2 O-5R1 + R2 --> R2arrow_forwardThe 2x2 linear system of equations -2x+4y = 8 and 4x-3y = 9 was put into the following -2 4 8 augmented matrix: 4 -3 9 This augmented matrix is then converted to row echelon form. Which of the following matrices is the appropriate row echelon form for the given augmented matrix? 0 Option 1: 1 11 -2 Option 2: 4 -3 9 Option 3: 10 ܂ -2 -4 5 25 1 -2 -4 Option 4: 0 1 5 1 -2 Option 5: 0 0 20 -4 5 ○ Option 1 is the appropriate row echelon form. ○ Option 2 is the appropriate row echelon form. ○ Option 3 is the appropriate row echelon form. ○ Option 4 is the appropriate row echelon form. ○ Option 5 is the appropriate row echelon form.arrow_forwardLet matrix A have order (dimension) 2x4 and let matrix B have order (dimension) 4x4. What results when you compute A+B? The resulting matrix will have dimensions of 2x4. ○ The resulting matrix will be a single number (scalar). The resulting matrix will have dimensions of 4x4. A+B is undefined since matrix A and B do not have the same dimensions.arrow_forward
- If -1 "[a446]-[254] 4b = -1 , find the values of a and b. ○ There is no solution for a and b. ○ There are infinite solutions for a and b. O a=3, b=3 O a=1, b=2 O a=2, b=1 O a=2, b=2arrow_forwardA student puts a 3x3 system of linear equations is into an augmented matrix. The student then correctly puts the augmented matrix into row echelon form (REF), which yields the following resultant matrix: -2 3 -0.5 10 0 0 0 -2 0 1 -4 Which of the following conclusions is mathematically supported by the work shown about system of linear equations? The 3x3 system of linear equations has no solution. ○ The 3x3 system of linear equations has infinite solutions. The 3x3 system of linear equations has one unique solution.arrow_forwardSolve the following system of equations using matrices: -2x + 4y = 8 and 4x - 3y = 9 Note: This is the same system of equations referenced in Question 14. If a single solution exists, express your solution as an (x,y) coordinate point with no spaces. If there are infinite solutions write inf and if there are no solutions write ns in the box.arrow_forward
- Hi, I need to make sure I have drafted a thorough analysis, so please answer the following questions. Based on the data in the attached image, develop a regression model to forecast the average sales of football magazines for each of the seven home games in the upcoming season (Year 10). That is, you should construct a single regression model and use it to estimate the average demand for the seven home games in Year 10. In addition to the variables provided, you may create new variables based on these variables or based on observations of your analysis. Be sure to provide a thorough analysis of your final model (residual diagnostics) and provide assessments of its accuracy. What insights are available based on your regression model?arrow_forwardI want to make sure that I included all possible variables and observations. There is a considerable amount of data in the images below, but not all of it may be useful for your purposes. Are there variables contained in the file that you would exclude from a forecast model to determine football magazine sales in Year 10? If so, why? Are there particular observations of football magazine sales from previous years that you would exclude from your forecasting model? If so, why?arrow_forwardStat questionsarrow_forward
- 1) and let Xt is stochastic process with WSS and Rxlt t+t) 1) E (X5) = \ 1 2 Show that E (X5 = X 3 = 2 (= = =) Since X is WSSEL 2 3) find E(X5+ X3)² 4) sind E(X5+X2) J=1 ***arrow_forwardQuestion 1: Let X be a random variable with p.m.f (|x| +1)² x= -2, -1, 0, 1,2 f(x) = C 0, O.W 1. The value of c. 2. The c.d.f. 3. E(X). 4. E(2x+3). 5. E(X²). 6. E(3x²+4). 7. E(X(3X+4)). 8. Var(X). 9. Var (6-3X). 10. Find the m.g.f of the random variable Xarrow_forwardI need help explaining on this examplearrow_forward
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