
Introductory Combinatorics
5th Edition
ISBN: 9780136020400
Author: Richard A. Brualdi
Publisher: Prentice Hall
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Question
Chapter 11, Problem 53E
To determine
To prove: A graph is a tree if and only if it does not contain any cycles, but the insertion of any new edge always creates exactly one cycle.
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Answer this two questions:
2 . We roll seven 20-sided dice, numbered 1 to 20. Show that it is always possible to find two disjoint nonempty subsets of the dice such that the sums of the shown faces of the dice in each of the subsets coincide(only one of the faces is considered to be shown) .
4. We are given a deck of 60 cards, 40 are identical black cards, 10 are identical red cards, and 10 are identical greenc ards. How may ways are there to deal the 60 cards to three distinct players so that everyone gets exactly 20 cards?
The acidity or alkalinity of a solution is measured using pH. A pH less than 7 is acidic; a pH greater than 7 is alkaline. The accompanying data represent the pH in samples of bottled water and tap
water. Complete parts (a) and (b).
Click the icon to view the data table.
(a) Determine the mean, median, and mode pH for each type of water. Comment on the differences between the two water types.
Select the correct choice below and fill in any answer boxes in your choice.
A. For tap water, the mean pH is
(Round to three decimal places as needed.)
B. The mean does not exist.
Data table
Тар
Bottled
7.64 7.45 7.46 7.50 7.68
7.45 7.10 7.56 7.46 7.52
5.15 5.09 5.31 5.20 4.78
5.52 5.31 5.13 5.31 5.21
7.69
7.46
5.23
5.24
Print
Done
-
☑
The median for the given set of six ordered data values is 29.5.
9 12 23 41 49
What is the missing value?
The missing value is ☐.
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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