Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 4 - Probability and Counting Rules - 4-4 Counting Rules - Extending the Concepts - Page 237: 67



Work Step by Step

We label the coins as: n, n, d, h Case1: select 1 coin: n, d, h (3 ways) Case:2 select 2 coins: nn, nd, nh, dh (4 ways) Case3: select 3 coins: nnd, nnh, ndh (3 ways) Case4: select 4 coins: nndh (1 way) In total there are 11 ways to select one or more coins.
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