MyGoalPrep LogoMyGoalPrep.com

Jee Main 2025 — Medium JEE math MCQ

Suppose \(A\) and \(B\) are the coefficients of 30th and 12th terms respectively in the binomial expansion of \((1 + x)^{2n-1}\). If \(2A = 5B\), then \(n\) is equal to
  1. A. 22
  2. B. 20
  3. C. 21
  4. D. 19

Solution

The correct option is **C**. (C. 21)

MATH

medium • PYQ Reworded
Question
Read carefully, then pick the best option.
Suppose AA and BB are the coefficients of 30th and 12th terms respectively in the binomial expansion of (1+x)2n−1(1 + x)^{2n-1}. If 2A=5B2A = 5B, then nn is equal to
AI hints
Ask for a nudge. Keep it specific.