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 1.7 - Introduction to Proofs - Exercises - Page 91: 1

Answer

Here is the proof. We have to prove that sum of two odd integers is even.

Work Step by Step

SOLUTION: Let, First odd integer (a) = 2k+1 & Second odd integer (b) = 2m+1 where in both. k and m are the any integers. Now, a + b should be even i.e multiple of 2. So, a + b = (2k+1) + (2m+1) =2k +2m +2 = 2(k+m+1) = even. REASON: As, k & m are integers and (k+m+1) is the multiple of 2 which shows it is even number. Hence, Proved.
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