Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If the sum of first n terms of an A.P. is cn 2 , then the sum of squares of these n terms is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
S n = cn 2 ; S n–1 = c(n – 1) 2 = cn 2 + c – 2 cn
T n = 2cn – c ; T n2 = (2cn – c) 2 = 4c 2 n 2 + c 2 – 4c 2 n
Sum = ∑ T n2 = 
+ nc 2 – 2c 2 n (n + 1)
= 
= 
= 
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