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TopNewestYou can't!The first time I had come across this question I really thought that it is not that tough and would have a nice solution.So after a lot of trying I had posted this question over here.So see the solution if you want (I hardly understood the solution,it's quite advance).However no one could come up with a closed form solution to this.So I guess it doesn't exist.

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Oh , k , thnx , sad couldnt find a solution

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