Orchard Planting Problem/Classic Form/10
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Classic Problem
$10$ trees are to be planted in an orchard so as to make the number of rows of $3$ trees the largest number possible.
That is:
$10$ points are to be configured in the plane so that the number of straight lines that can be drawn through exactly $3$ of these points is maximised.
Solution
The number of rows is $12$.
$\blacksquare$