MathCastle
Counting & ProbabilitySuperchallengeCounting Strategies: Casework, Complementary & Overcounting

Counting Strategies: Casework, Complementary & Overcounting · Superchallenge problem

Twelve chairs are evenly spaced around a circular table and numbered 11 through 1212. In how many ways can you choose 55 of the chairs so that no two chosen chairs are next to each other around the circle?