The distance between each tree =3
So, the distance between 8th and 7th = 3
7th and 6th =3and so on
8th to 7th + 7th to 6th + 6th to 5th + 5th to 4th + 4th to 3th + 3th to 2nd + 2nd to 1st
7 (3) =21
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