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This question here involves a puzzle goal that turns out to be impossible. Are puzzle problems like this allowed in general, if it's known that they're impossible?

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    $\begingroup$ In addition to Kevin's answer: how do you know that the OP knew it was impossible? Maybe they were honestly asking, and the answer "That can't be done because X" will be useful to them. $\endgroup$
    – WendiKidd
    May 17 '14 at 23:02
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Sure. Especially if it's something that seems like it ought to be possible, it can be an interesting answer, given an appropriate proof/explanation, that something is not, in fact, possible.

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  • $\begingroup$ I agree, the best answer should prove that it's not possible. $\endgroup$
    – A E
    Nov 19 '14 at 14:25

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