USAMTS Has Started
USAMTS started today. You can look at past problems on their website to see if you want to compete. If you do, you need to register on the site. Also, […]
September 2017
Don’t Overcount Solution
There are 30 liberals and 30 conservatives. How many 8-person committees can be formed if at least one of them must be a liberal? If we choose a liberal and […]
Don’t Overcount
Sometimes, you may make a combinatorial argument which seems reasonable, but you find that your answer is larger than the correct answer. Here is a problem which may trip you […]
Combinatorics Solutions
Here are the solutions for the Combinatorics Problems handout. Make sure to read all the solutions, as many of the techniques discussed frequently show up in competition. Combinatorics Solutions