Welcome to Episode 3 of Season 2: Unlocking Combinatorics and Geometry! This audio source focuses on binomials and recursion, two fundamental concepts in mathematics often encountered in these competitions. The audio introduces the binomial theorem and related identities, such as Pascal's Identity and the Hockey Stick Identity, providing formulas and examples. It then transitions to recursion, defining it and illustrating its principles through problems involving counting possibilities with specific constraints, such as climbing stairs or forming subsets. The purpose of this audio is to equip students with the theoretical understanding and problem-solving techniques necessary to tackle AMC-level questions related to these topics.

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