Question

.) Find the sum of the first n terms of the geometric sequence for the values of a1and r.

n = 4, a1 = 228, r = 4.8



A. 25,167.476


B. 6575.52


C. 25,214.976


D. 31,790.496

Answer 1

Sn = a(r^n - 1)/(r - 1)
S4 = 228(4.8^4 - 1)/(4.8 - 1) = 228(530.8416 - 1)/3.8 = 228(529.8416)/3.8 = 120,803.8848 / 3.8 = 31,790.496