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# A wallet contains five \$10 bills, four \$5 bills, and six ISBN: 9780321629111 32

## Solution for problem 18E Chapter 2

Probability and Statistics for Engineers and the Scientists | 9th Edition

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Problem 18E

A wallet contains five \$10 bills, four \$5 bills, and six \$1 bills (nothing larger). If the bills are selected one by one in random order, what is the probability that at least two bills must be selected to obtain a first \$10 bill?

Step-by-Step Solution:

Answer : Step 1 : A wallet contains five \$10 bills, four \$5 bills, and six \$1 bills (nothing larger). \$10 on the first choice is a total of 5+6=11 chances out of 4 + 5 + 6 = 15. So \$10 on the first choice is a total of 11 and chances out of 15. Let the probability that at least two bills must be selected to obtain a first \$10 bill. Geometric...

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##### ISBN: 9780321629111

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