Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If S n denote the sum of first n terms of an A.P. and f(n) = 
, then 
is equal to
Text Solution
Verified by ExpertsThe correct answer is:
A
S 3n = 
[2a + (3n – 1)d]
S 2n = 
[2a + (2n – 1) d]
S n = 
[2a + (n – 1)d]
S 2n – S n = 
[2a + (3n – 1)d]
= 3 = f(n)
S = 
= 
3 
= 6
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