JEE Main 2020 — Sequences And Series Question with Solution
From: JEE Main 2020 (Online) 8th January Morning Slot
Question
Let ƒ : R R be such that for all
x R
(21+x + 21–x), ƒ(x) and (3x + 3–x) are in A.P.,
then the minimum value of ƒ(x) is
(21+x + 21–x), ƒ(x) and (3x + 3–x) are in A.P.,
then the minimum value of ƒ(x) is
Choose an option
Show full solutionCorrect option: C
Correct answer
C3
Step-by-step explanation
f(x) =
As we know, A.M > G.M
As we know, A.M > G.M
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This is a previous-year question from JEE Main 2020, 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.