Question

What is the explicit rule for this geometric sequence?

27, 9, 3, 1,

Answer 1

Divide by 3 or multiply by ¹/₃, starting from 27

Explanation:

The change between 27 to 9 is either divide by 3 or minus 18.

The change between 9 to 3 is either divide by 3 or minus 6.

From there, we can tell that only dividing by 3 is consistent.