ClassFlow
Class Flow: Permutations and Combinations
[Free Registration/Login Required] This is an interactive lesson on the probability concept of permutations and combinations. It introduces the concepts by allowing the students to move around objects. At the end of the flipchart...
Interactive Mathematics
Interactive Mathematics: Permutations
Permutations are used in several detailed examples to demonstrate the method for finding the number of arrangements of events.
Interactive Mathematics
Interactive Mathematics: Combinations
The combination function is used to solve probability counting problems. Several examples are presented with detailed solutions.
Annenberg Foundation
Annenberg Learner: The Towers Problem
Build as many different looking towers as is possible, each exactly four cubes high using two colors of Unifix Cubes. Convince yourself and others that you have found all possible towers four cubes high and that you have no duplicates.