Flip three fair coins. Let the number of heads be the number of dice we roll. If the numbers on the upper faces of the dice add up to 5, what is the probability that two heads turned up?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Flip three fair coins. Let the number of heads be the number of dice we roll. If the numbers on the upper faces of the dice add up to 5, what is the probability that two heads turned up? 

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