Problem 9 (2015 AIME I)
AIMEHard
From module Advanced Counting and Casework
Problem
This is a 2015 AIME I problem focusing on inclusion-exclusion. See the full problem statement on AoPS.
From module Advanced Counting and Casework
This is a 2015 AIME I problem focusing on inclusion-exclusion. See the full problem statement on AoPS.