Question

The sum ²⁰C₀ + ²⁰C₁ + ²⁰C₂ +.............. + ²⁰C₁₀ is equal to

a. \(2^{20} \frac{20!}{(10!)^2}\)

b. \(2^{19}-\frac12 \frac{20!}{(10!)^2}\)

c. \(2^{19} +\frac{20!}{(10!)^2}\)

d. none of these

Answer 1

Correct option is d. none of these

In the expansion of (1 + x)²⁰, put x = 1