Khan Academy: Pre Calculus: Binomial Theorem (Part 3)

The last video in a three-part series on the Binomial Theorem from the Khan Academy. 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 actually sums all of the possible combinations of a's and b's for a given "n" or power. [11:59]