Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 1 - Section 1.8 - Proof Methods and Strategy - Supplementary Exercises - Page 112: 21

Answer

a) False b) True c) False d) True e) False f) True

Work Step by Step

a) $False$ $R$eason: 4 does not divide 5 into an integer. b) $True$ $R$eason: 2 divides 4 in 2(an integer) c) $False$ $R$eason: The given statement states that every positive integer is divisible by every positive integer; in this we have a case where this was not possible. d) $True$ $R$eason: The given statement states that there exists a positive integer that divides every positive integer, which is true for the positive real number 1 e) $False$ $R$eason: The given statement states that there exists an integer that is divisible by every other integer, but this integer cannot exists because there will always exist a larger number than the chosen number that does not divide the chosen number. f) $True$ $R$eason: The given statement states that 1 divides every integer, which is true since the result is the integer itself.
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