2010 OIM Problems/Problem 6

Problem

12 people sit around a circular table on which there are 28 vases. Two people can see each other if and only if there is no vase aligned with them. Prove that there exist at least two people who can see each other.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also

OIM Problems and Solutions