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On the world environment day tree planta...

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 tree, in the third row three trees and so on. Find the total number of trees in 25 rows.

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The correct Answer is:
The total number of trees in 25 rows are 325.
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