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?

(In reply to re: 9 rows, 9 trees by Richard)

The same couild be said for Tristan's solution if you wished to pursue it.

And if you wanted to split straws, any pair of trees form a line.

Posted by brianjn on 2006-10-23 18:48:57