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MathNet 2016-part-04 — 184 problems (EN–VI) Question 182

Math Olympiad Vault · MathNet 2016-part-04 — 184 problems (EN–VI)

Question 182

Given six three-element subsets of the set $X$ with at least $5$ elements, show that it is possible to color the elements of $X$ in two colors such that none of the given subsets is all in one color.