Question

Find the sum to ten terms of the G.P. 6, 1.2, 0.24,..........

Answer 1

First term= a=6 Common ratio = r = 1.2/6= 0.2 <1 n=10 Sum of n terms Sn= a(1- r^n)/(r-1) S10= [6*(1-(0.2)^10]/(1-0.2) = [6*(1-(0.2)^10]/(0.8)