If GP is 8,-16,32,-64 THAN, THE COMMAN RATIO IS -2 RIGHT OR WRONG Share with your friends Share 0 Ankush Jain answered this Given, G.P is 8, -16, 32, -64.Common ratio 0 View Full Answer Sumaiyya Attar answered this 8, -16, 32,-64 is a G.P then commen ratio=r= -16/8= -2... hence it is right 1 Akhi Chandran answered this IT IS RIGHT. 1