Answer
$V\cap I'$
15
Work Step by Step
$V$: the value of the stock increased.
$I$: it was an Internet stock.
The value of the stock increased but (AND) it was not an Internet stock: $V\cap I'$
$n(V\cap I')=n(V)-n(I)=30-15=15$
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 7.1 - Sample Spaces and Events - Exercises - Page 458: 57
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