Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If 
, ∀ n ≥ 1 then 
is equal to
Text Solution
Verified by ExpertsThe correct answer is:
D
= 2(3 n – 1)
⇒ t 1 + t 2 + …..+ t n = 2(3 n – 1)
We can do t n = S n – S n–1
⇒ t n = 2(3 n –1) – 2(3 n–1 – 1)
= 2[3 n – 3 n–1 ] = 4.3 n–1 Now,
= 
. 
= 
. 
= 
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