2013 Aime I [top] Official

The AIME is unique because it removes the safety net of guessing. On the AMC, a student can sometimes eliminate answers or plug in choices to find the solution. On the AIME, if a student makes a minor calculation error—misplacing a negative sign or miscalculating a modulo—the answer is simply wrong. The 2013 AIME I exemplified this rigorous standard.

So download the 2013 AIME I, set a timer for 180 minutes, and see how many integers you can find. Good luck. 2013 aime i

This combinatorics problem asked for the number of ways to assign letters to envelopes with certain restrictions (a derangement variant). Many students attempted to use the inclusion-exclusion principle but tripped over the factorial computations. The answer was a manageable three-digit number (e.g., 144), but arriving there required careful casework. The AIME is unique because it removes the