Draw a five-pointed star. Place five trees on the points and five more where the lines intersect.
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You don't
I believe you said there'd be 12 in each row.
Six ways. 15 rows of 2 trees 6 rows of 5 trees 3 rows of 10 trees and 2 rows of 15 trees 5 rows of 6 trees 10 rows of 3 trees * * * * * How about 1 row of 30 trees and 30 rows of 1 tree each?
You cannot do that since 5 rows x 4 trees = 20 trees total. But we have 10 trees to plant!
20 trees