Not many introductory probability and statistics textbooks emphasize the use of probability trees to make complex probability calculations. This is puzzling in view of the power that trees bring to organizing such calculations for students. An effective classroom technique is discussed is this note.
Hurley, W. J.
"A Note on Probability Trees,"
Journal of Modern Applied Statistical Methods:
2, Article 28.
Available at: http://digitalcommons.wayne.edu/jmasm/vol6/iss2/28