Number of trees \(= 1024\).
Since number of rows \(=\) number of columns, the trees are planted in a square.
Therefore number of rows/columns \(=\sqrt{1024}\)...(1 mark)
\(\sqrt{1024}=\) \(\sqrt{2\times2\times2\times2\times2\times2\times2\times2\times2 \times2}\)
\(\sqrt{1024}=32\)...(1 mark)
Number of rows/columns after removing the trees \(= 32 -1 = 31\)...(0.5 marks)
\(\therefore\) remaining number of trees \(=31^2\)...(0.5 marks)
Therefore, number of trees that were removed = \( 32^2 - 31^2 = (32+31) = 63\)....(1 mark)
[From the identity \((n+1)^2\) - \((n)^2 = (n+1) + n)\)]