On the world environment day tree plantation programme was arranged on a land which is triangular in shape. Trees are planted such that in the first row there is one tree, in the second row there are two trees, in the third row three trees and so on. find the total number of trees in the $25$ rows.

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Solution

There is one tree in first row, 2 trees in 2nd row, 3 trees in 3rd row
So, if there are 25 rows there are
$1 + 2 + 3 + . . . . . + 25$ trees
$= \frac{25 (26)}{2} = 325$
$∴ 325$ trees

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On the world environment day tree plantation programme was arranged on a land which is triangular in shape. Trees are planted such that in the first row there is one tree, in the second row there are two trees, in the third row three trees and so on. find the total number of trees in the 25 rows.

There is one tree in first row, 2 trees in 2nd row, 3 trees in 3rd rowSo, if there are 25 rows there are1+2+3+.....+25 trees =25(26)2=325∴325 trees

On the world environment day tree plantation programme was arranged on a land which is triangular in shape. Trees are planted such that in the first row there is one tree, in the second row there are two trees, in the third row three trees and so on. find the total number of trees in the $25$ rows.

There is one tree in first row, 2 trees in 2nd row, 3 trees in 3rd row
So, if there are 25 rows there are
$1 + 2 + 3 + . . . . . + 25$ trees
$= \frac{25 (26)}{2} = 325$
$∴ 325$ trees