In this video, Salman Khan of Khan Academy explains probability density functions.
Khan Academy

In this video, Salman Khan of Khan Academy explains probability. Part 7 of 8.
Khan Academy

Video includes explanation of factorials and also how to add, multiply, and divide factorials and some common
mistakes.
You Tube

It also gives formulas, description, etc for statistics.
Wolfram Mathworld

In this video, Salman Khan of Khan Academy explains probability. Part 3 of 8.
Khan Academy

In this video, Salman Khan of Khan Academy explains probability. Part 2 of 8.
Khan Academy

Definition of Combinations
Wolfram MathWorld

Definition of Betting "Odds"
Wolfram MathWorld
