Coins & Triangles

 

Solution

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The minimum number of coins to remove is four. 

The unique solution to this puzzle (except rotations and reflections) is shown in the illustration and the removed coins are shown with dotted outlines. 

It can be seen that the centers of any three coins among the remaining ones don't lie in the corners of an equilateral triangle.

 
Last Updated: January 26, 2006
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