11 the world mental day programme was arranged on the land which is triangular shape trees are planted such that in the First row there is 110 2nd there are two trees in the third row there are three trees and so on find the total number of trees in 20 30
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According to problem, each row contains same no of trees as its row number.
Thus, total no of plants in 25 rows is calculated by -
Sn = 1 + 2 + 3 + .... + 25
Using formula Sn=n(n+1)/2
Sn = 25 × 26 / 2
Sn = 325
Total 325 tress are planted during tree plantation program.
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