A couple plans to have three children. What is the probability that a) they have all girls?   b) they have at least one boy?

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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A couple plans to have three children. What is the probability that

a) they have all girls?  

b) they have at least one boy?

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