Question

Question 12 please help guys

Answer 1

(1 + x)ⁿ/(1 - x) = (C₀ + C₁x + C₂x² + .... + Cnxⁿ)(1 + x + x² + ..... )

The coefficient of x^r = C₀ + C₁ + C₂ + ... + Cr = 2ⁿ for r = n.

Coefficient of x^r = C₀ + C₁ + C₂ + ... + Cr if r > n.

Therefore, r ≥ n.

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