I reviewed lecture #2 just now.

Lecture #2 introduced the indicator function. Then some basic probability formulas were proved with indicator functions. Then we reviewed the discrete distributions. The lecture ended on Laplace transforms, generating functions and characteristic functions. We also covered expansions of e in this lecture. I will review my table of integrals handbook for expansions of e and other formula involving e.

So I have two lectures reviewed and 11 to go.