(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a circle city of radius 4 we have 18 cell phone power stations. Each station covers the area at distance within 6 from itself. Show that there are at least two stations that can transmit to at least five other stations.

2. Relevant equations

3. The attempt at a solution

All I can say is that I'm pretty sure this is an application of the pigeonhole principle.

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# A (probably) simple combinatorial problem

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