Answer
Event A can be expressed as the complement of event B, where Event B is the occurrence of no heads. Thus:
E_{B} = {TTT}
P(B) = P(E_{B})
= 1/8
Thus
P(A) = 1 - P(B)
= 1 - 1/8
= 7/8
Work Step by Step
As given in answer
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 3 - Probability - Exercises 3.35 - 3.62 - Learning the Mechanics - Page 131: 3.48b
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