Seeing this I though this thing was promoted, and for avoiding for the question becoming boring, I didn't answer it suddenly and waited and I did mentioned that I knew the answer, maybe it's just misunderstanding that I don't know the answer. Anyways, what's the state/condition regarding such things?

See this and this. I edited one to include answer in question, I just didn't edited other just because.

  • $\begingroup$ related meta.math.stackexchange.com/questions/15017/… $\endgroup$ – quid Mar 7 '15 at 16:46
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    $\begingroup$ Most of the time, you should not post a question on math.SE if you already know the answer. That is something that the StackExchange corporation encourages on other StackExchange sites, but it has never been a significant part of this site. And, in particular, this is not a site for "puzzles" or "challenges". The following post actually has no question at all: math.stackexchange.com/questions/1176622/… - because "I have solved this" is not a question. A question would be something that you want to know that you don't know. $\endgroup$ – Carl Mummert Mar 8 '15 at 3:03

Self-answering a question means that you actually post an answer to your question, not that you had already solved the question in the past. Thus, your second link isn't a "self-answered question" by any measure.

Instead of editing the question to include an answer, it is best to post an answer to the question, and place a note in the question saying "this is a self-answered question." The note in the question reduces the likelihood that someone closes or downvotes by mistake.


Puzzle Questions are allowed in math.se ... But include the information in the original post that you know the answer!

HERE is an example of mine.


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