BdMO National Junior 2009/3

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
Post Reply
samiul_samin
Posts:1007
Joined:Sat Dec 09, 2017 1:32 pm
BdMO National Junior 2009/3

Unread post by samiul_samin » Sun Feb 24, 2019 12:38 am

The nine squares of a $3\times 3$ checkerboard must be painted so that each row,each column and each of the two digonals have no two squares of the same colour.What is the least number of colours needed?
Last edited by samiul_samin on Sun Feb 24, 2019 4:32 pm, edited 1 time in total.
Top
samiul_samin
Posts:1007
Joined:Sat Dec 09, 2017 1:32 pm

Re: BdMO National Junior 2009/3

Unread post by samiul_samin » Sun Feb 24, 2019 1:53 pm

Answer:$\fbox 5$
Diagram:
Screenshot_2019-02-24-13-51-05-1.png
Top
Post Reply

Return to “National Math Olympiad (BdMO)”