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What is twice the answer to this question ?

Just thought some people here would like this brain-teaser ;)

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closed as too broad by Aza Jan 22 '15 at 10:51

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Zero. … Ø, maybe? $\endgroup$ – Ry- Oct 6 '14 at 15:57
  • $\begingroup$ @minitech In the same category, ε, the empty string. $\endgroup$ – nhaarman Oct 6 '14 at 20:28
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Given that your question is self referential and requests twice its own answer, we need something that is twice itself. Zero works - two times zero is still zero, so if the answer to your question is zero then twice the answer to your question is also zero.

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  • $\begingroup$ But why should it be Zero in the first place? $\endgroup$ – d'alar'cop Oct 6 '14 at 16:38
  • $\begingroup$ @d'alar'cop Is there any reason why it shouldn't be zero? $\endgroup$ – Rob Watts Oct 6 '14 at 16:39
  • $\begingroup$ Not really... just as there isn't any reason it shouldn't be potato :p Would you happen to have a reason that it should be Zero? $\endgroup$ – d'alar'cop Oct 6 '14 at 16:41
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    $\begingroup$ @d'alar'cop what if you worded the question "what is twice itself?" - you would answer in a heartbeat, right? Zero is the only number that works. $\endgroup$ – Kate Gregory Oct 6 '14 at 17:16
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    $\begingroup$ @AeJey - So will minus infinity, $-\infty$; or $\aleph_7$, etc. $\endgroup$ – h34 Jan 10 '15 at 15:30
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Another possible answer is "deer".

Twice deer would mean two deer. And since the plural of "deer" is "deer" than "deer" is a possible answer.

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Another non-trivial possibility:

$\infty$

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It is NaN (not a number), isn't it?

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  • $\begingroup$ LOL! You actually tried to multiply "answer to this question" by 2 using code. $\endgroup$ – Pyraminx Jan 10 '15 at 18:02
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Nothing.

Because twice nothing is still nothing.

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  • $\begingroup$ I like this answer slightly better than "Zero". It's more general and includes the other answer. $\endgroup$ – TheRubberDuck Oct 8 '14 at 18:33
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The question can be rephrased as "What is "the answer to this question" written twice in a row?"

This would be "the answer to this question the answer to this question".

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  • $\begingroup$ @FlorianF, nono. I suggest that you just need to double the set of symbols: "the answer to this question". So the procedure must exactly the same as if you are asked "What is bla-bla said twice in a row?". $\endgroup$ – klm123 Oct 6 '14 at 18:16
  • $\begingroup$ I understand now. Comment removed. $\endgroup$ – Florian F Oct 6 '14 at 21:28
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The answer is twice itself. 2 possibilities so far.
1. If it's a number, it can be 0 as well as infinity.
2. If it's a statement, "twice the answer of your question" should work.

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