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This was asked to me by a friend. $N$ men sit around a circular table. Man 1 has a sword with him and he kills the Man 2, Man 3 picks up this sword and kills the next person i.e. Man 4. Thus the man next to a killed man picks up the sword and kills the one next to him. In the end, which Man will be left behind?

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This is a variation of the Josephus problem. – MJD Jan 4 '13 at 2:27
thanks a lot for that. If you write it as an answer, I will accept it. – dineshdileep Jan 4 '13 at 4:47
I'm glad I could help. – MJD Jan 4 '13 at 4:55
up vote 1 down vote accepted

This is a special case of the Josephus problem.

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