101 Puzzles in Thought and Logic

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Courier Corporation, 1957 - Games & Activities - 125 pages
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Do you like puzzles based on logic and reasoning? Try this one: In a certain bank the position of cashier, manager, and teller are held by Brown, Jones, and Smith, though not necessarily in that order. The teller, who was an only child, earns the least. Smith, who married Brown's sister, earns more than the manager. What position does each man fill? If you like to entertain yourself and stretch mental muscles on problems like this or more difficult ones, here are 101 entirely new problems for which you need no special knowledge, no mathematical training — simply the ability to reason clearly. Follow these problems through and you will not only increase your ability to think in abstractions, but you will enjoy solving murder problems and robberies, see which fisherman are liars and how a blind man can identify color purely by logic, and enjoy dozens of interesting situations. Puzzles range from easy to relatively difficult, and will please both beginners and experts.
 

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Contents

Section 1
7
Section 2
9
Section 3
11
Section 4
13
Section 5
15
Section 6
17
Section 7
23
Section 8
27
Section 20
54
Section 21
56
Section 22
58
Section 23
60
Section 24
62
Section 25
64
Section 26
68
Section 27
71

Section 9
29
Section 10
30
Section 11
31
Section 12
35
Section 13
37
Section 14
39
Section 15
41
Section 16
43
Section 17
46
Section 18
48
Section 19
50
Section 28
73
Section 29
74
Section 30
81
Section 31
84
Section 32
86
Section 33
88
Section 34
90
Section 35
92
Section 36
96
Section 37
98
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About the author (1957)

The late C. R. Wylie, Jr., taught for many years at the University of Utah, where he was Chairman of the Department of Mathematics.

A Dover Original
Clarence Raymond Wylie, Jr., had a long career as a writer of mathematics and engineering textbooks. His Advanced Engineering Mathematics was the standard text in that field starting in the 1950s and for many decades thereafter. He also wrote widely used textbooks on geometry directed at students preparing to become secondary school teachers, which also serve as very useful reviews for college undergraduates even today. Dover reprinted two of these books in recent years, Introduction to Projective Geometry in 2008 and Foundations of Geometry in 2009.

The author is important to our program for another reason as well. In 1957, when Dover was publishing very few original books of any kind, we published Wylie's original manuscript 101 Puzzles in Thought and Logic. The book is still going strong after 55 years, and the gap between its first appearance in 1957 and Introduction to Projective Geometry in 2008 may be the longest period of time between the publication of two books by the same author in the history of the Dover mathematics program. Wylie's 1957 book launched the Dover category of intriguing logic puzzles, which has seen the appearance of many books by some of the most popular authors in the field including Martin Gardner and, more recently, Raymond Smullyan.

Here's a quick one from 101 Puzzles in Thought and Logic:

If it takes twice as long for a passenger train to pass a freight train after it first overtakes it as it takes the two trains to pass when going in opposite directions, how many times faster than the freight train is the passenger train?

Answer: The passenger train is three times as fast as the freight train.

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