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Flat Out (Posted on 2003-12-17) Difficulty: 3 of 5
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)

Comments: ( Back to comment list | You must be logged in to post comments.)
pennies | Comment 9 of 24 |
put one penny in the middle and make a circle of pennies around it = 7.
If you put them in a square - they don't touch across the diagonal.
  Posted by Bruce on 2003-12-20 14:08:53
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