# How do you find the common ratio of the geometric sequence 135, 45, 15, 5?

##### 1 Answer

May 19, 2017

#### Explanation:

To find the common ratio,

Check with at least two different pairs of terms to be sure:

You can also use this idea to form an equation if necessary.

In general:

In this case we have:

Remember that we ALWAYS multiply by

So although in this case you might see the term-to term rule as

"Divide by 3", it is better to say "Multiply by