Discrete Mathematics and Its Applications, Seventh Edition

by Rosen, Kenneth

Published by McGraw-Hill Education

ISBN 10: 0073383090

ISBN 13: 978-0-07338-309-5

Chapter 4 - Section 4.6 - Cryptography - Supplementary Exercises - Page 308: 16

Answer

$n=4$

Work Step by Step

$4!+1=24+1=25$, which is divisible by 5 and so not prime.

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