To find the common ratio of a geometric sequence, you can divide any term by the previous term.
In the sequence given: 2, 6, 18, 54, ...
Let's calculate the common ratio (r):
-
Divide the second term by the first term:
\( r = \frac{6}{2} = 3 \) -
Divide the third term by the second term:
\( r = \frac{18}{6} = 3 \) -
Divide the fourth term by the third term:
\( r = \frac{54}{18} = 3 \)
In each case, the common ratio r is 3.
Therefore, the common ratio is 3.