A coin which has probability p of coming up Heads is tossed three times. Let X be the number of Heads observed.  What is ℙ(?=1)?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 22E
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A coin which has probability p of coming up Heads is tossed three times. Let X be the number of Heads observed.  What is ℙ(?=1)?

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