Difference between revisions of "2006 Romanian NMO Problems/Grade 7/Problem 2"
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A square of side <math>n</math> is formed from <math>n^2</math> unit squares, each colored in red, yellow or green. Find minimal <math>n</math>, such that for each coloring, there exists a line and a column with at least 3 unit squares of the same color (on the same line or column). | A square of side <math>n</math> is formed from <math>n^2</math> unit squares, each colored in red, yellow or green. Find minimal <math>n</math>, such that for each coloring, there exists a line and a column with at least 3 unit squares of the same color (on the same line or column). | ||
==Solution== | ==Solution== | ||
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==See also== | ==See also== | ||
*[[2006 Romanian NMO Problems]] | *[[2006 Romanian NMO Problems]] | ||
[[Category:Olympiad Combinatorics Problems]] | [[Category:Olympiad Combinatorics Problems]] | ||
Revision as of 07:33, 27 August 2008
Problem
A square of side 
is formed from 
unit squares, each colored in red, yellow or green. Find minimal , such that for each coloring, there exists a line and a column with at least 3 unit squares of the same color (on the same line or column).
Solution
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