I am thinking of one thing.

It is either an ellipse (shape),

Or, it is the letter O

Or, it is the number 0

You can ask me one question and guess what the thing is.

I can only answer No,or sometime or always.

So what is it?

  • $\begingroup$ I've closed this as a duplicate because it's easy to translate questions from the linked puzzle into questions here and vice versa. $\endgroup$ – Deusovi Apr 18 '17 at 20:54
  • $\begingroup$ Why is this a duplicate? It does not concern 1,2 or 3? Only O,0 and ellipse $\endgroup$ – DrD Apr 19 '17 at 12:24
  • $\begingroup$ @DeepakMahulikar:  Read the comment immediately above yours. $\endgroup$ – Peregrine Rook Apr 19 '17 at 17:42
  • $\begingroup$ More broadly: Guessing among three possibilities with a single question $\endgroup$ – Peregrine Rook Apr 19 '17 at 17:44
  • $\begingroup$ @Deusovi. Isn't this just another puzzle of the same type? I can't see how you can use the questions from the linked puzzle here. This question is comparing a shape, a letter and a number so a purely mathematical question is not possible. $\endgroup$ – Wolff Apr 21 '17 at 16:21

I ask you -

Can you find it in the upper right corner of the obverse face of a US $1 bill?
enter image description here

The text always contains an O (letter)
The serial number sometimes contains a 0 (digit)
That part of a dollar never contains an ellipse.

Having said that, I suspect this question is too broad ... we'll probably see plenty of good answers.

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  • $\begingroup$ Aren't Os ellipses and therefore the answer for ellipse would be "yes"? $\endgroup$ – Jonathan Allan Apr 18 '17 at 20:54
  • $\begingroup$ @JonathanAllan Then the question devolves to "Is it an ellipse, an ellipse, or a zero?" at best, or "Is it an ellipse, an ellipse, or an ellipse?" at worst; allowing them to be considered equivalent breaks the question entirely. $\endgroup$ – Rubio Apr 18 '17 at 21:05
  • $\begingroup$ Not necessarily, it just means we cannot use that precise nature to make our decision (and this possibly means it is nowhere near as broad as the 1,2,3 question). $\endgroup$ – Jonathan Allan Apr 18 '17 at 21:10

Can you rotate it ninety degrees without altering it?


You can always rotate the letter O, never rotate the number 0, and sometimes rotate an ellipse (because all circles are also ellipses).

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  • $\begingroup$ Is number 0 always an Oval? In all Fonts? $\endgroup$ – DrD Apr 19 '17 at 12:52
  • $\begingroup$ This is not correct for the letter O — it is usually not a perfect circle. $\endgroup$ – Peregrine Rook Apr 19 '17 at 17:40

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