Discrete Mathematics and Its Applications, Seventh Edition

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

Chapter 6 - Section 6.2 - The Pigeonhole Principle - Exercises - Page 406: 38

Answer

20 cables

Work Step by Step

Let us take 4 computers out of 8 , they must have at least 4 cables to access all the 4 printers. The remaining 4 computers must have 4 cables each, attached to all the printers , so that no matter the choice of 4 computers we can access the 4 printers . Hence total cables = 4 + 4$\times$4 = 20
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