Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If S n denotes the sum upto n (1 ≤ n ≤ 9) terms of the series 1 + 22 + 333 +……+ 
then for n ≥ 2
A
S n – S n–1 = 
(10 n – n 2 + n)
(10 n – n 2 + n)
B
S n = 
(10 n – n 2 + 2n – 2)
(10 n – n 2 + 2n – 2)
C
9(S n – S n–1 ) = n(10 n – 1)
D
S 3 = 356
Text Solution
Verified by ExpertsThe correct answer is:
C
(c, d)
⇒ A & B are not true
9(S 2 – S 1 ) = 198
Hence C & D are correct.
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