perplexus.info :: General : Flat Out

Flat Out (Posted on 2003-12-17)

What is the minimum number of pennies that can be placed upon a table so that each penny touches three, and only three, others?

(All the pennies must lie flat on the table.)

See The Solution Submitted by DJ

Rating: 4.3333 (9 votes)

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First Thoughts

| Comment 1 of 24

At first, it looks like a contradiction to the "Four Color Map Problem". Perhaps I need to read further.

Posted by Bob Genisot on 2003-12-17 14:21:36

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