Mark Sellke

In middle and high school I participated in many math competitions. In 2016 I cofounded Contest Math Tutoring. My favorite competition math books at the pre-olympiad level are Art of Problem Solving's Counting and Probability series. My favorite book at the olympiad level is Problems from the Book.

Olympiad problems I've written for USA team selection tests, in increasing difficulty order:

Some math olympiad handouts I've made:

Compilations of some of my favorite mathematical gems:

Here are some of my own math competition results.