Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The sum of first 9 terms of the series 
+ 
+ 
+ ......... is :
Text Solution
Verified by ExpertsThe correct answer is:
B
Sol. T n = 
T n = 
(n + 1) 2
T n = 
[n 2 + 2n + 1]
S n = 
S n = 
n = 9
S 9 = 
= 
[285 + 90 + 9]
= 
= 96.
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