Question

Find the common ratio for the following sequence.

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

A. -2
B. -1/2
C. 1/2
D. 2

Answer 1

common ratio = an-a(n-1)=a₂-a₁
Data:
a₁=1/2
a₂=-1/4

commo ratio=(-1/4) / (1/2)=-2/4=-1/2

Answer: B. -1/2