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Answer:
No. of trees in first row (a) = 1
Difference between no. of trees planted in two successive rows (d) = 1
No. of rows (n) = 25
Sn = n/2[2a + (n – 1) d]
∴ S25 = 25/2[2 (1) + (25 – 1) 1]
∴ S25 = 25/2[2 + 24]
∴ S25 = 25/2 (26)
∴ S25 = 25 (13)
∴ S25 = 325
I hope it's helpful to you ❤️❤️
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