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Binomial Theorem
Binomial Expansion, Coefficients
jee_main_2026_april_6_shift_2
Grade None

Question:

The coefficient of x⁵ in the expansion of (1 + x)^9 is:
A. 84
B. 105
C. 120
D. 126

Step-by-Step Solution

Key Concept: Coefficient of xʳ in (1+x)^n is C(n, r).
Step 1: Coefficient of x⁵ = C(9, 5) = 126.
Correct Answer: D
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