Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 7 - Section 7.2 - Probability Theory - Exercises - Page 466: 1

Answer

.25

Work Step by Step

Suppose $p_h = 3p_t$. Since $p_h + p_t = 1$, this means that $4p_t = 1$, so $p_t = .25$.
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