Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If first, fifth and last terms of an A.P. is λ , m, p respectively and sum of the A.P. is 
then k is -
Text Solution
Verified by ExpertsThe correct answer is:
A
Let common difference = d & number of terms = n
∴ T 5 : m = λ + (5 –1) d ⇒ d = (m – λ ) /4
∴ T n : p = λ + 
⇒ n = 
∴ Sum of n terms of A.P. = 
[First term + last term]
= 
. 
[ λ + p] …(i)
Comparing equation (i) with the given summation, we get
k = 2.
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