Shodor Education Foundation
Shodor Interactivate: Two Colors Applet
Choose one of three boxes and choose one ball from the box to look at conditional probabilities.
CK-12 Foundation
Ck 12: Algebra Ii: 5.2 Probability
In this section, students will explore different methods for determining the probability of complex events and conditional probabilities (such as unions, intersections, and complements).
Richland Community College
Richland Community College: Introduction to Probability
This site from Richland Community College provides an overview of probability including a list of probability rules. Several examples using dice are included.