I remmeber reading before in a probability book that this is an unsolved problem (I don't know if it still is or not):(adsbygoogle = window.adsbygoogle || []).push({});

Given a rectangular carpet with dimensions m x n, find the probability that a coin with radius r will fall on the carpet without touching another coin that's already on the carpet (number of coins on the carpet would have to be known I guess).

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# What is this problem called?

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