Find by referring to the tree diagram and using Bayes' formula. A tree diagram has a root labeled Start that splits into 3 primary branches labeled U, V, and W. Starting from the top, the paths to the primary branches are labeled 0.1, 0.3, and 0.6. Each primary branch splits into 2 secondary branches, labeled C and C'. Starting from the top, the paths to the secondary branches are labeled 0.9, 0.1, 0.3, 0.7, 0.6, and 0.4.