JEE Main 2021 — Binomial Theorem Question with Solution
From: JEE Main 2021 (Online) 18th March Evening Shift
Question
Let denote the binomial coefficient of xr in the expansion of (1 + x)n.
If , then + is equal to ___________.
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Show full solutionCorrect answer: 19
Correct answer
19
Step-by-step explanation
=
According to question,
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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.