Problems for Year 23 (2011-2012)

Note: Year 23 consists of three rounds of five problems each.

Submission Deadline: January 17, 2012

Web deadline: 3 PM Eastern / Noon Pacific on the due date
Mail deadline: Postmarked on or before the due date

Remember to fully justify all your answers - don't just send numerical answers.

Read the complete rules to learn more about how to submit your solutions.

Past rounds and solutions:

• Round 1: due date October 11, 2011
  
  • Problems
  • Solutions
  • Grading Criteria
• Round 2: due date November 14, 2011
  
  • Problems
  • Solutions
  • Grading Criteria

You can also check out past years' USAMTS problems.