MINI #62 - SOLVING COUNTING PROBLEMS USING CASES Probability, Counting and Combinatorics Video by Art of Problem Solving's Richard Rusczyk.
MASS POINTS (PARTS 1 & 2) Plane Geometry Proportional Reasoning Learn what Mass Points are and how to use them to solve problems involving side lengths and areas of triangles. Mass Points Part 1 (above) covers the fundamentals of Mass Points, while Mass Points...