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let the no of rows be x
so the no of trees in each row will also be equal to x
so total trees =x*x=x²
..so there are 39 rows and 39 trees in each row.
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Let the no.f trees in each row =x
let the no.f rows=x
therefore total no.f trees =x raised to 2
x raised to 2 =1521
therefore x=39
there fore no.of rows =39
no.f trees in each row =39

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