Answer
The argument is invalid.
Work Step by Step
The argument is valid if and only if every possible diagram illustrates the argument’s decision some D are B .Since there are no D that are B , the argument is not valid.The argument is invalid.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - 3.8 Arguments and Euler Diagrams - Exercise Set 3.8 - Page 204: 31
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