If the ratio of the sum of the first 6 terms of a G.P. to the sum of the first 3 terms of the G.P. is 126, what is the common ratio of the G.P?
Select the correct option: A) 3 B) 1/3 C) 2 D) 5 E) 1/5
126=(a1+a2+a3+a4+a5+a6)/(a1+a2+a3)   Factorize the same terms   126=1+(a4+a5+a6)/(a1+a2+a3)   Write every term with respect to r   a1=a1   a2=a1*r^1   a3=a1*r^2   .........   126=1+(a1(r^3+r^4+r^5))/(a1(1+r^1+r^2))   125=(r^3 (1+r^1+r^2))/((1+r^1+r^2))   125=r^3   r=5   5
<result>D</result>
If the ratio of the sum of the first 6 terms of a G.P. to the sum of the first 3 terms of the G.P. is 126, what is the common ratio of the G.P?