The final version of the board deck is in one of two folders, A or B. Two AI agents can see both. One always answers correctly. The other always gets it wrong, confidently, every time. You don’t know which agent is which, and you get to ask one question to one of them.
What do you ask?
Answer: Ask either agent, “Which folder would the other agent say has the final deck?” Then open the other folder. If you asked the reliable agent, it accurately reports the wrong answer. If you asked the unreliable one, it gets the right answer wrong. Either way, you hear the wrong folder.
(The file is called final_v7_REAL_use-this-one.pptx. No puzzle can help you with that.)