Question

Find the common ratio for the following sequence.

1/2, -1/4, 1/8, -1/16, ...

Answer 1

common ratio for the following sequence is -1/2

1/2 x -1/2 = -1/4
-1/4 x -1/2 = 1/8
1/8 x -1/2 = - 1/16
-1/16 x -1/2 = 1/32

Answer 2

1/4/-1/2 = -1/2

1/8/-1/4= -1/2
-1/16/1/8= -1/2
.....
Common ratio is -1/2