> The trickiness is that it was a part of a set of easy questions. You have 3 same numbers x x x, then change two of them, and ask what's the third y y ? It see

> The trickiness is that it was a part of a set of easy questions. You have 3 same numbers x x x, then change two of them, and ask what's the third y y ? It seems obvious it's y again. OK… That's all? I start to see the problem. But I'm not going to write what my conclusion is as this would get likely down-voted into oblivion. (I was actually expecting down-votes already just for asking but still wanted to understand what the issues here is as I honestly don't see any "tricky part" in the "puzzle" at all.)