How would I find the value of the common ratio?

The first term= 11, the sum of the first 12 terms= 2922920

Guest Nov 24, 2019

#1**0 **

Sorry about that. I read it as an AP:

2922920 =11 * (R^N - 1) /(R - 1)

265720 =(R^N - 1)/ (R - 1)

265720R - 265720 =R^12 - 1

R^12 - 265720R + 265721 =0, solve for R

Use graphing calculator to get integer solutions:

R =1 or R = 3

R = 1 doesn't work

**R = 3 works.**

Guest Nov 24, 2019

edited by
Guest
Nov 24, 2019