JEE Main 2021 — Binomial Theorem Question with Solution
From: JEE Main 2021 (Online) 22th July Evening Shift
Question
If the constant term, in binomial expansion of is 180, then r is equal to __________________.
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Show full solutionCorrect answer: 8
Correct answer
8
Step-by-step explanation
General term
....... (1)
& (10 R)r 2R = 0
....... (2)
R = 8 or 5 reject equation (1) not satisfied
At R = 8
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This is a previous-year question from JEE Main 2021, 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.