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