On n x n board, 2n-1 fields were chosen. Prove that you can paint some of the chosen (not zero) fields green so that
a) in every line and every column, number of green fields is odd
b) in every line and every column, number of green fields is even
Thanks for help in advance
Board
Re: Board
Duplicate topic
See this one: viewtopic.php?t=2421#p11968
See this one: viewtopic.php?t=2421#p11968
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Nur Muhammad Shafiullah | Mahi
Use $L^AT_EX$, It makes our work a lot easier!
Nur Muhammad Shafiullah | Mahi
Re: Board
If you want to notify about a post previously made, do not post that again, instead you can bump that topic so that everyone can see that.
See more here: http://www.matholympiad.org.bd/forum/vi ... 8025#p8036
See more here: http://www.matholympiad.org.bd/forum/vi ... 8025#p8036
Please read Forum Guide and Rules before you post.
Use $L^AT_EX$, It makes our work a lot easier!
Nur Muhammad Shafiullah | Mahi
Use $L^AT_EX$, It makes our work a lot easier!
Nur Muhammad Shafiullah | Mahi