JEE Main 2019 — Binomial Theorem Question with Solution
From: JEE Main 2019 (Online) 9th January Evening Slot
Question
The coefficient of t4 in the expansion of is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B15
Step-by-step explanation
= (1 t6)3 (1 t)3
= (1 3C1t6 + 3C2t12 3C3t18) (1 t)3
coefficient of t4 is 1 coefficient of t4 in (1 t)3
= 1 3+41C4 (By multinomial theorem)
= 6C4 = 15
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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.