In a row of trees, one tree is fifth from either end of the row. How many trees are there in the row?
8
9
7
11
10
5×2-1= 9
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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