Answer
successful and not new authors
25
Work Step by Step
$S\cap N'$ is the set of successful and not new authors.
If an author is not new, it is established. Therefore $n(S\cap N')=S\cap E=25$
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: 53
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