JEE Main 2019 — Binomial Theorem Question with Solution
From: JEE Main 2019 (Online) 10th January Evening Slot
Question
The positive value of for which the co-efficient of x2
in the expression x2 is 720, is -
Choose an option
Show full solutionCorrect option: A
Correct answer
A4
Step-by-step explanation
The general term in the expansion of the binomial expression is
Therefore, the general term in the expansion of the binomial expression
is
Now, for the coefficient of ,
So, the coefficient of is
Given the problem asks for the positive value of , .
So, the correct option is (A) 4.
Therefore, the general term in the expansion of the binomial expression
is
Now, for the coefficient of ,
So, the coefficient of is
Given the problem asks for the positive value of , .
So, the correct option is (A) 4.
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This is a previous-year question from JEE Main 2019, covering the Binomial Theorem 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.