Difference between revisions of "2006 Romanian NMO Problems/Grade 7/Problem 2"
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Revision as of 10:19, 27 July 2006
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).