Binomial theorem

0:00 Introduction
3:47 Motivation
15:40 Pascal's triangle
21:54 Multiplication principle
25:44 Permutations
33:53 Combinations
48:40 Combinatorial explanation of the Binomial theorem (not a proof)
54:26 Calculation of binomial coefficients
1:00:45 Statement of the Binomial theorem
1:03:14 Applications to binomial expansions