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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!

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Help spread the word about AoPS by wearing Art of Problem Solving T-Shirts to your school and math events!

All T-Shirts are 100% cotton.

To add T-Shirts to your order, complete the form below and click "Add to Cart". (All sizes are Adult sizes.)

Shirts are $12.

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The Art of Problem Solving Bookstore now offers two titles from the creator of Math Olympiads in the Elementary and Middle Schools. Click here and here to check them out.