JEE Main 2021 — Sequences And Series Question with Solution
From: JEE Main 2021 (Online) 1st September Evening Shift
Question
Let Sn = 1 . (n 1) + 2 . (n 2) + 3 . (n 3) + ..... + (n 1) . 1, n 4.
The sum is equal to :
The sum is equal to :
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Let Tr = r(n r)
Tr = nr r2
Now,
Option (a)
Tr = nr r2
Now,
Option (a)
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This is a previous-year question from JEE Main 2021, covering the Sequences And Series chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.