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Tree planting exercise (Posted on 2006-10-21) Difficulty: 3 of 5
How can you plant seven straight rows of trees with six trees per row such that twenty-one trees are planted in total?

How can you plant nine straight rows of trees with three trees per row such that nine trees are planted in total?

See The Solution Submitted by JLo    
Rating: 2.0000 (2 votes)

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Solution part 1 | Comment 3 of 10 |

Arrange 7 points equally around a circle (about 51.42857 degrees apart). Join straight lines connecting each pair that is 154.2857 degrees apart, making a 7-pointed star. At each intersection, including the points of the star, plant a tree.

  Posted by Charlie on 2006-10-21 19:27:58
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