1. What is the common ratio of the geometric sequence 2,-6,18, ?
2.Find the common ratior of a geometric sequence in which the first is 5 and second
term is 15
3. Determine the common ratio r of an increasing geometric sequence, for which the
first term is 5 and the third term is 20.
4. Find the common ratio r of an alternating geometric sequence an, for which
ar =125, az = -25, and az= 5.
= .
5 Find the fourth term of a geometric sequence, whose first term is 2 and the comma
ratio is 3.​