I asked this question a few days back.

An argument with my friend over $\bigcup [a+\frac{1}{n},b]$

I had asked this question to know whether I was right in my approach, which other users approved to be correct. Now as you can see I have two answers to the question.

On what basis should I mark the question solved. I mean, ofcourse, the question was never unsolved, (and leaving a question with a solution marked unsolved doesn't seem right), but which answer do I mark as accepted answer? Thanks. :)

• Which one helped to convince your friend? (Or did you just stop being friends with him? :-)) – Asaf Karagila Oct 11 '14 at 12:39
• I didn't get a chance to tell him the given answers. He called me that night to tell me he understood my argument. – Swapnil Tripathi Oct 11 '14 at 12:48