Board

For discussing Olympiad Level Combinatorics problems
adam23
Posts:13
Joined:Mon Oct 29, 2012 8:00 pm
Board

Unread post by adam23 » Tue Oct 30, 2012 10:09 pm

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

User avatar
*Mahi*
Posts:1175
Joined:Wed Dec 29, 2010 12:46 pm
Location:23.786228,90.354974
Contact:

Re: Board

Unread post by *Mahi* » Tue Oct 30, 2012 10:33 pm

Duplicate topic
See this one: viewtopic.php?t=2421#p11968
Please read Forum Guide and Rules before you post.

Use $L^AT_EX$, It makes our work a lot easier!

Nur Muhammad Shafiullah | Mahi

adam23
Posts:13
Joined:Mon Oct 29, 2012 8:00 pm

Re: Board

Unread post by adam23 » Tue Oct 30, 2012 11:04 pm

I know but there is no answer. So I make a new topic. Please help me :)

User avatar
*Mahi*
Posts:1175
Joined:Wed Dec 29, 2010 12:46 pm
Location:23.786228,90.354974
Contact:

Re: Board

Unread post by *Mahi* » Wed Oct 31, 2012 12:16 pm

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
Please read Forum Guide and Rules before you post.

Use $L^AT_EX$, It makes our work a lot easier!

Nur Muhammad Shafiullah | Mahi

Post Reply