Welcome to Episode 1 of Season 2: Unlocking Combinatorics and Geometry! This episode on combinatorics introduces fundamental principles for counting, such as casework and complementary counting. It provides formulas and theorems for permutations with repeated elements and combinations. Several examples and problems illustrate how to calculate the number of ways to arrange letters in words, form license plates, select integers with specific properties, and analyze sets. The podcast also defines the Principle of Inclusion and Exclusion (PIE) and offers examples of its application in set theory problems. Overall, the material covers basic combinatorial techniques and their use in solving various counting scenarios.