[CocaKoala]

I'm not convinced; it at least tells you if the interviewee will rush to an answer that appears correct and say "All of them", or if they'll consider it a little more carefully and say "The rest of them". Or if they'll ask for a strict definition of what it means to pass a chair on the way up, to clarify whether or not you count the chair that you're riding on as one that you pass.