Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The sum of the series
a – (a + d) + (a + 2d) – (a + 3d) + … (2n + 1) terms is
Text Solution
Verified by ExpertsThe correct answer is:
C
S = a – (a + d) + (a + 2d) – (a + 3d) +...(a + 2nd) ….(i)
This is A.G.P. series
(–1)S = – a + (a + d) – (a + 2d) + … – (a + 2nd) ….(ii)
(i) – (ii) :
2S = a + 0 + (a + 2nd)
S = a + nd
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A series whose n th term is , the sum of r terms will be
If , then is
The sum of the series is
The sum of the series 1.2.3 + 2.3.4 + 3.4.5 + ….. to n terms is
The sum of the first n terms of the series 1 2 + 2.2 2 + 3 2 + 2.4 2 + 5 2 + 2.6 2 + . . . is , wh…
An A.P. whose first term is unity and in which the sum of the first half of any even number of term…