1
Part of 2016 All-Russian Olympiad
Problems(2)
Exchanging Carpets
Source: 2016 All-Russian Olympiad,Problem 9.1
6/7/2016
A carpet dealer,who has a lot of carpets in the market,is available to exchange a carpet of dimensions either with a carpet with dimensions or with two carpets with dimensions and (the customer can select the number ).The dealer supports that,at the beginning he had a carpet with dimensions greater than and,after some exchanges like the ones we described above,he ended up with a set of carpets,each one having one dimension greater than and one smaller than .Is this possible?Note:The customer can demand from the dealer to consider a carpet of dimensions as one with dimensions .
Supportcombinatorics
Math in NBA
Source: All russian olympiad 2016,Day1,grade 11,P1
5/5/2016
There are teams in NBA and every team play games in the year. Bosses of NBA want to divide all teams on Western and Eastern Conferences (not necessary equally), such that number of games between teams from different conferences is half of number of all games. Can they do it?
combinatorics