Question

The coefficient of xⁿ in the binomial expansion of (1 – x)^–2 is–

• A. $\frac{2^{n}}{2!}$
• B. n + 1
• C. n
• D. 2n

Answer 1

Answer: (B)

n + 1

Answer 2

(1 – x)^–2 = 1 + 2x + 3x² + .....(n+1)xⁿ+....

\ Coefficient of xⁿ = n + 1