Answer
$.3$
Work Step by Step
$P(A\cup B )=P(A)+P(B)=.3+.4=.7 $
$P((A\cup B)')=1-P(A\cup B )=1-.7=.3$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 7 - Section 7.3 - Probability and Probability Models - Exercises - Page 483: 37
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