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Discussion of Problem 1480. Coupons

SubjectAuthorProblemUpdatedAnswers
How to solve this problem?Aram Shatakhtsyan1480. Coupons5 Aug 2010 02:322  
Ideailyamit1480. Coupons18 Nov 2009 16:025  
I have WA#2. Please, help me. Tkach Andriy1480. Coupons18 Mar 2007 22:371  
How to prove?SpaceFlyer1480. Coupons11 Oct 2006 06:100  

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