Finite Math and Applied Calculus (6th Edition)

Published by Brooks Cole
ISBN 10: 1133607705
ISBN 13: 978-1-13360-770-0

Chapter 7 - Section 7.1 - Sample Spaces and Events - Exercises - Page 458: 60

Answer

$n(P\cup N')=90$ This value represents the number of pharmaceutical stocks or not unchanged (i.e. changed) stocks, or both.

Work Step by Step

$n(S)=100,~~n(P)=50,~~N(n)=40$ $n(N')=n(S)-n(N)=100-40=60$ $n(P\cap N')=n(P \cap V)+n(P \cap D)=10+10=20$ $n(P\cup N')=n(P)+n(N')-n(P\cap N')=50+60-20=90$ This value represents the number of pharmaceutical stocks or not unchanged (i.e. changed) stocks, or both.
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