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Discussion of Problem 1480. Coupons

I have WA#2. Please, help me.
Posted by Tkach Andriy 23 Oct 2006 18:18
I think that matrix have some stucture but I don't now this.
Re: I have WA#2. Please, help me.
Posted by PSV 18 Mar 2007 22:37
It is so easy try only with yourself it's always better :)