Mathematics All Around (6th Edition)
Mathematics All Around (6th Edition)
6th Edition
ISBN: 9780134506470
Author: Pirnot
Publisher: PEARSON
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Chapter 2.4, Problem 55E

Challenge Yourself

As you saw in Section 2.3, a common mistake in using the Inclusion-Exclusion Principle is to say n ( A ∪ B ) = n ( A ) + n ( B ) and forget that elements in A ∩ B have been counted twice. Show by giving counterexamples that the following two formulas for counting the elements of three sets are incorrect:

a. n ( A ∪ B ∪ C ) = n ( A ) + n ( B ) + n ( C )

b. n ( A ∪ B ∪ C ) = n ( A ) + n ( B ) + n ( C ) − n ( A ∩ B ) − n ( A ∩ C ) − n ( B ∩ C )

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Chapter 2 Solutions

Mathematics All Around (6th Edition)

Ch. 2.1 - In Exercises 1-12, use set notation to list all...Ch. 2.1 - Prob. 2ECh. 2.1 - Prob. 3ECh. 2.1 - Prob. 4ECh. 2.1 - Prob. 5ECh. 2.1 - Prob. 6ECh. 2.1 - Prob. 7ECh. 2.1 - Prob. 8ECh. 2.1 - Prob. 9ECh. 2.1 - Prob. 10E
Ch. 2.1 - Prob. 11ECh. 2.1 - Prob. 12ECh. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - Prob. 15ECh. 2.1 - Prob. 16ECh. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - In Exercises 13-22, use an alternative method to...Ch. 2.1 - Prob. 22ECh. 2.1 - Prob. 23ECh. 2.1 - Prob. 24ECh. 2.1 - Prob. 25ECh. 2.1 - Prob. 26ECh. 2.1 - Prob. 27ECh. 2.1 - Prob. 28ECh. 2.1 - Prob. 29ECh. 2.1 - Prob. 30ECh. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - Prob. 35ECh. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - In Exercises 31-42, replace each # with either or...Ch. 2.1 - Find nA for each of the following sets A. 1, 3, 5,...Ch. 2.1 - Find nA for each of the following sets A. 3, 4, 5,...Ch. 2.1 - Find nA for each of the following sets A. x: x is...Ch. 2.1 - Find nA for each of the following sets A. x: x is...Ch. 2.1 - Prob. 47ECh. 2.1 - Find nA for each of the following sets A. x: x is...Ch. 2.1 - In Exercises 49-52, draw a bag diagram similar to...Ch. 2.1 - In Exercises 49-52, draw a bag diagram similar to...Ch. 2.1 - Prob. 51ECh. 2.1 - In Exercises 49-52, draw a bag diagram similar to...Ch. 2.1 - Prob. 53ECh. 2.1 - Prob. 54ECh. 2.1 - Prob. 55ECh. 2.1 - Describe each of the following sets as either...Ch. 2.1 - Prob. 57ECh. 2.1 - Prob. 58ECh. 2.1 - In Exercises 57-64, find an element of set A that...Ch. 2.1 - In Exercises 57-64, find an element of set A that...Ch. 2.1 - Prob. 61ECh. 2.1 - Prob. 62ECh. 2.1 - Prob. 63ECh. 2.1 - Prob. 64ECh. 2.1 - Applying What Youve Learned In Exercises 65-68,...Ch. 2.1 - Prob. 66ECh. 2.1 - Prob. 67ECh. 2.1 - Prob. 68ECh. 2.1 - Prob. 69ECh. 2.1 - Prob. 70ECh. 2.1 - Prob. 71ECh. 2.1 - Prob. 72ECh. 2.1 - Prob. 73ECh. 2.1 - Prob. 74ECh. 2.1 - Prob. 75ECh. 2.1 - Prob. 76ECh. 2.1 - Communicating Mathematics The Analogies Principle...Ch. 2.1 - Prob. 78ECh. 2.1 - Communicating Mathematics Give a careful...Ch. 2.1 - Communicating Mathematics Often good notation...Ch. 2.1 - Challenge Yourself Sets of well-known people. Let...Ch. 2.1 - Prob. 84ECh. 2.1 - We will define a paradox as a statement that...Ch. 2.1 - We will define a paradox as a statement that...Ch. 2.1 - Prob. 87ECh. 2.2 - In Exercises 1-8, decide whether each pair of sets...Ch. 2.2 - In Exercises 1-8, decide whether each pair of sets...Ch. 2.2 - Prob. 3ECh. 2.2 - Prob. 4ECh. 2.2 - Prob. 5ECh. 2.2 - Prob. 6ECh. 2.2 - In Exercises 1-8, decide whether each pair of sets...Ch. 2.2 - Prob. 8ECh. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - Prob. 12ECh. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - In Exercises 15-24, decide whether each pair of...Ch. 2.2 - In Exercises 15-24, decide whether each pair of...Ch. 2.2 - In Exercises 9-14, decide whether each statement...Ch. 2.2 - Prob. 18ECh. 2.2 - Prob. 19ECh. 2.2 - In Exercises 15-24, decide whether each pair of...Ch. 2.2 - In Exercises 15-24, decide whether each pair of...Ch. 2.2 - Prob. 22ECh. 2.2 - Prob. 23ECh. 2.2 - Prob. 24ECh. 2.2 - Prob. 25ECh. 2.2 - Prob. 26ECh. 2.2 - Prob. 27ECh. 2.2 - Prob. 28ECh. 2.2 - If set A has five elements, how many subsets does...Ch. 2.2 - If A has seven elements, how many subsets does A...Ch. 2.2 - Use the following table to answer Exercises 31-34....Ch. 2.2 - Use the following table to answer Exercises 31-34....Ch. 2.2 - Use the following table to answer Exercises 31-34....Ch. 2.2 - Prob. 34ECh. 2.2 - Prob. 35ECh. 2.2 - Prob. 36ECh. 2.2 - Prob. 37ECh. 2.2 - Prob. 38ECh. 2.2 - Dominos Pizza advertises that you can order your...Ch. 2.2 - If Dominos Pizza wants to advertise that there are...Ch. 2.2 - Burger King advertises that Have it your way. 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Express each set in...Ch. 2.3 - Prob. 82ECh. 2.3 - In Exercise 81 84, assume AB. Express each set in...Ch. 2.3 - In Exercise 81 84, Assume AB. 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World issues...Ch. 2.4 - Prob. 36ECh. 2.4 - Prob. 37ECh. 2.4 - Applying What Youve Learned 38. Online music...Ch. 2.4 - Prob. 39ECh. 2.4 - Prob. 40ECh. 2.4 - Prob. 41ECh. 2.4 - Prob. 42ECh. 2.4 - Prob. 43ECh. 2.4 - Prob. 44ECh. 2.4 - Prob. 45ECh. 2.4 - Prob. 46ECh. 2.4 - Prob. 47ECh. 2.4 - Prob. 48ECh. 2.4 - A person can safely receive a transfusion from...Ch. 2.4 - Prob. 50ECh. 2.4 - Prob. 51ECh. 2.4 - Communicating Mathematics In Figure 2.13a,...Ch. 2.4 - Math in Your: Life: Between the Numbers Validity...Ch. 2.4 - Math in Your Life: Between the Numbers Validity of...Ch. 2.4 - Challenge Yourself As you saw in Section 2.3, a...Ch. 2.4 - Prob. 56ECh. 2.4 - Prob. 57ECh. 2.4 - Challenge Yourself Thinking along the lines of...Ch. 2.4 - Prob. 59ECh. 2.4 - Prob. 60ECh. 2.5 - Prob. 1ECh. 2.5 - Prob. 2ECh. 2.5 - Prob. 3ECh. 2.5 - Prob. 4ECh. 2.5 - Prob. 5ECh. 2.5 - Sharpening Your Skills In Exercises 1-8, show that...Ch. 2.5 - Prob. 7ECh. 2.5 - Sharpening Your Skills In Exercises 1-8, show that...Ch. 2.5 - In Exercises 9-12, we give an expression...Ch. 2.5 - In Exercises 9-12, we give an expression...Ch. 2.5 - In Exercises 9-12, we give an expression...Ch. 2.5 - In Exercises 9-12, we give an expression...Ch. 2.5 - Prob. 13ECh. 2.5 - Prob. 14ECh. 2.5 - Prob. 15ECh. 2.5 - Prob. 16ECh. 2.5 - Prob. 17ECh. 2.5 - Prob. 18ECh. 2.5 - Prob. 19ECh. 2.5 - Prob. 20ECh. 2.5 - Prob. 21ECh. 2.5 - Prob. 22ECh. 2.5 - In Example 3, we showed you how to match the...Ch. 2.5 - In Example 3, we showed you how to match the...Ch. 2.5 - In Example 3, we showed you how to match the...Ch. 2.5 - In Example 3, we showed you how to match the...Ch. 2.5 - Communicating Mathematics In Example 3, what did...Ch. 2.5 - Communicating Mathematics What was the essence of...Ch. 2.5 - Communicating Mathematics How would you convince...Ch. 2.5 - Communicating Mathematics How would you convince...Ch. 2.5 - Communicating Mathematics In Example 3, why did we...Ch. 2.5 - In constructing the number x in Example 4, how...Ch. 2.5 - Prob. 33ECh. 2.5 - Prob. 34ECh. 2.5 - The arithmetic of infinite cardinal numbers has...Ch. 2.5 - Prob. 36ECh. 2.5 - Imagine that we bend a line segment representing...Ch. 2.5 - Use an argument similar to that of Exercise 37 to...Ch. 2.CR - Prob. 1CRCh. 2.CR - Explain whyCh. 2.CR - Make up a bag diagram to illustrate the set 3, ,1,...Ch. 2.CR - Find the cardinal number of each of these sets....Ch. 2.CR - Prob. 5CRCh. 2.CR - Decide whether each statement is true and false....Ch. 2.CR - Prob. 7CRCh. 2.CR - Prob. 8CRCh. 2.CR - Prob. 9CRCh. 2.CR - Using the same sets as in Exercise 9, find the...Ch. 2.CR - Prob. 11CRCh. 2.CR - Use DeMorgans laws to represent (AB) in a...Ch. 2.CR - a. List three algebraic properties satisfied by...Ch. 2.CR - State the Inclusion-Exclusion Principle. What is a...Ch. 2.CR - Use the following information to answer the given...Ch. 2.CR - .A survey was taken of college freshman regarding...Ch. 2.CR - Prob. 17CRCh. 2.CR - What is the definition of an infinite set?Ch. 2.CR - Show that the set of natural numbers is infinite.Ch. 2.CR - In matching the rational numbers with the natural...Ch. 2.CR - In creating the number x in Example 4 in Section...Ch. 2.CT - Chapter Test Use an alternative method to express...Ch. 2.CT - Prob. 2CTCh. 2.CT - Prob. 3CTCh. 2.CT - Let U={1,2,3,...,10} and let A={1,2,5,6,9},...Ch. 2.CT - Explain why {}:Ch. 2.CT - Prob. 6CTCh. 2.CT - Prob. 7CTCh. 2.CT - Make up a bag diagram to illustrate the set...Ch. 2.CT - Prob. 9CTCh. 2.CT - Prob. 10CTCh. 2.CT - Prob. 11CTCh. 2.CT - Chapter Test Use the following information to...Ch. 2.CT - Chapter Test A survey was taken of drivers...Ch. 2.CT - Prob. 14CTCh. 2.CT - Prob. 15CTCh. 2.CT - Chapter Test In matching the rational numbers with...Ch. 2.CT - Chapter Test 17.In creating the number x in...Ch. 2.CT - Using the blood type classifications that we...

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