Question

Which of the following are geometric sequences?

a: 5,10,20,40,80,160
b: 3,6,9,12,15,18
c: 10,5,2.5,1.25,0.625,0.3125
d:1,3,9,27,81

Answer 1

A, C, D

Explanation:

This is because the ratio between te consecutive terms are constant, that is ×2, ×0.5 and ×3 respectively