[Free Registration/Login Required] An informational text explaining the difference between atoms an molecules. A question sheet is available to help students build skills in reading comprehension.

Video lesson solving for the probability of winning the mega millions jackpot.

Video showing how to find the probability of exactly three heads in five flips of a coin using combinations. Includes link to additional practice problems. [6:51]

Video showing the probability of exactly 3 heads in 5 flips using combinations.

Video lesson finding the probability of making at least three out of five free throws by calculating combinations. [10:36]

Video lesson finding the probability of making at least three out of five free throws by calculating combinations.

A video that introduces the concept of combinations by building on knowledge of permutations.

Video lesson deriving the formula for finding the probability of k heads in n flips. Includes the formula for calculating combinations. [11:40]

Video lesson deriving the formula for finding the probability of k heads in n flips.

This video shows the probability of winning a 4-number lottery?

Intuition behind why binomial expansion involves combinatorics. This segment illustrates how the Binomial Theorem is directly related to combinatorics using (a + b)^3 as an example. Students can clearly see how a binomial expansion...

Thi is a video lesson finding the probability of getting exactly three heads out of eight flips of a coin by calculating combinations.

Video describes finding the conditional probability that a fair coin was picked given there were four heads out of six flips.

Video lesson demonstrating the probability of getting a certain hand in a game of cards by using combinations. Includes link to additional practice problems. [10:51]

Video lesson demonstrating the probability of getting a certain hand in a game of cards by using combinations. I

Video lesson finding the probability of a specific set of four numbers being the winning set by calculating combinations. [5:10]

Thinking about how many ways you can pick four colors from a group of 6.

Video lesson finding the probability of getting exactly three heads out of eight flips of a coin by calculating combinations. [9:10]

This QuickTime movie discusses permutations, gives examples, and demonstrates how to write the notation. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

This QuickTime movie introduces permutations and gives examples. A pdf worksheet is available by clicking on the hyperlink at the bottom of the page. As you watch and listen to the teacher and student interact it helps clarify the...

This QuickTime movie discusses permutations, gives examples, and demonstrates how to write the notation. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

This QuickTime movie gives an excellent demonstration of the use of factorials as illustrated in a children's book. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

This video presents the solution to a combination problem that requires an extended response to solve it. The teacher and student work through it together to find a sensible solution. As you watch and listen to the teacher and student...

This video [1:53] asks the question: How do we keep track of how many robots we've made? You can learn more about what combinatorics is and how we use it at Pixar.