 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2025/ib/paper-4/7h/a/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

{1, 3}

and

{2, 4}

. The first is open because state 3 can enter 4 and cannot return; the second is closed.

 New to topics? Read the docs here!