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Part of 1996 Bosnia and Herzegovina Team Selection Test

Problems(1)

Bosnia and Herzegovina TST 1996 Day 2 Problem 2

Source: Bosnia and Herzegovina Team Selection Test 1996

9/20/2018
Group of 1010 people are buying books. We know the following: i)i) Every person bought four different books ii)ii) Every two persons bought at least one book common for both of them Taking in consideration book which was bought by maximum number of people, determine minimal value of that number
combinatoricspigeonhole principle