Join the USAMO Guide Discord Server. Regular updates are posted there!

Let me Join!
Dismiss

Problem 23 (2022 AMC 8)

AMC 8Hard

From module Counting Fundamentals

Problem

A \triangle or \bigcirc is placed in each of the nine squares in a 33-by-33 grid. Shown below is a sample configuration with three \triangle's in a line. How many configurations will have three \triangle's in a line and three \bigcirc's in a line? [See figure in original PDF]

Select an answer

Show me the solution

← Back to all problems