Question

Find the sum of first 20 terms of the GP √3, 2√3, 4√3, 8√3…….

Answer 1

r = \(\frac{3\sqrt{3}}{\sqrt{3}}\) = 2;

s₂₀ = \(\frac{a(r^n-1)}{r-1} = \frac{\sqrt{3}(2^{20} - 1)}{2-1}\) =√3 (2²⁰ - 1)