Answer
$X\cap Y=\{\}$
Work Step by Step
$X=\{April,June,September, November\}$
$Z=\{September, November,October,December\}$
There are no months that are both $30$ and $31$ days long, thus $X\cap Y=\{\}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Extension - Apply Set Theory - Practice - Page 716: 14
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