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Omni-MATH / Does there exist a set S of 100 points in a plane such that the center of mass of any 10 points in S is also a point in S?

Problem

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problem

Does there exist a set SS of 100100 points in a plane such that the center of mass of any 1010 points in SS is also a point in SS?
Plain-text mathematical notation (without MathML)
Does there exist a set S of 100 points in a plane such that the center of mass of any 10 points in S is also a point in S?
Original LaTeX notation
Does there exist a set $S$ of $100$ points in a plane such that the center of mass of any $10$ points in $S$ is also a point in $S$?

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Source and history

Official source

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