Shodor Education Foundation
Shodor Interactivate: Lesson: Tree Diagrams and Probability
This lesson plan helps students develop tree diagrams and figure probability of events based on diagrams. Lots of resources are available to support teachers and students at this website.
Shodor Education Foundation
Shodor Interactivate: Lesson: Conditional and Simultaneous Probability
This lesson plan deals with conditional probability and the probability of simultaneous events. Problems included in this lesson tend to have solutions that are counterintuitive. This presents an opportunity to investigate more deeply...
Wolfram Research
Wolfram Math World: Disjoint Sets
This math site explains disjoint sets via example and definition. This site has links to related topics.
Interactive Mathematics
Interactive Mathematics: Probability and Statistics
Mini lessons are provided for learning concepts in the world of probability and statistics. Topics include counting and probability, permutations, combinations, independent and dependent events, and distributions. Links to online...
Curated OER
Complementary Sets
This page gives a good discussion of Venn diagrams, including a Venn diagram of two disjoint, or mutually exclusive, sets.