Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises: 10

Answer

n(A) = 12

Work Step by Step

A = {X|X is a month of a year} We know that months of the year are : January, February, March, April, may, June, July, August, September, October, November, December. Therefore the Set A = {January, February, March, April, may, June, July, August, September, October, November, December} So, there are 12 elements in the set = cardinal no = n(A) = 12.
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