Answer
The error made was double counting the yellow 'B'. The true probability is 4/5.
Work Step by Step
$P(yellow) = 3/5$
$P(letter) =2/5$
$P(yellow and letter) = 1/5$
$P (yellow or letter) = 3/5+2/5 -1/5 = 4/5$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 12 - Data Analysis and Probability - 12-8 Probability of Compound Events - Lesson Check - Page 768: 7
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