Art of Problem Solving's Intermediate Counting and Probability starts on June 19. Learn about one-to-one correspondences, the principle of inclusion-exclusion, generating functions, pigeonhole principle, recursion, and conditional probability. Click here to enroll today!

The Art of Problem Solving Resources pages include:

Articles for students, teachers, and parents, including How to Write a Solution, Building a Successful MATHCOUNTS Program, Stop Making Stupid Mistakes, and many more.
A list of some of our favorite books.
The AoPS Internet Guide, with links to:

Art of Problem Solving's Introduction to Counting and Probability starts on June 10. Learn about permutations, combinations, Pascal's triangle, probability, combinatorial identities, and the Binomial Theorem. Click here to enroll today!