JEE Main 2023 · MathsNumerical answerNumerical valueMediumCalculation

JEE Main 11 April 2023, Shift 1, Maths Q21

Question 21 of 90 in this shift, Maths question 21 of 30, Section B.

The mean of the coefficients of

x, x^2, \ldots, x^7

in the binomial expansion of

(2+x)^9

is ______________.

Official answer

2736

NTA final key.

Chapter: Binomial Theorem
Topic: Binomial Coefficients
Idea tested: Sum of all Coefficients

Same idea in other shifts

Asked 3× in all

31 Jan 2024, Shift 2 · Q23Let the coefficient of $x^r$ in the expansion of $(x+3)^{n-1}+(x+3)^{n-2}(x+2)+(x+3)^{n-3}(x+2)^2+\ldots+(x+2)^{n-1}$ be $\alpha_r$ . If…HardNumerical value
2 Apr 2017 (offline) · Q67The value of $(^{21}C_1-{}^{10}C_1)+(^{21}C_2-{}^{10}C_2)+(^{21}C_3-{}^{10}C_3)+(^{21}C_4-{}^{10}C_4)+\ldots+(^{21}C_{10}-{}^{10}C_{10})$ …MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.