Question

The sequence 18, 9, 9/2, 9/4, 9/8, ... represents the percentage of votes a particular political candidate has according to polls each day after a scandal. The sequence has a common

Answer 1

Common ratio

• 9/18=1/2
• 9/2/9=1/2
• 9/4/9/2=1/2

Common ratio is 1/2

Answer 2

• r = 1/2

Explanation:

Given sequence:

• 18, 9, 9/2, 9/4, 9/8, ...

We can see this is a GP and its common ratio is:

• r = 9/8 ÷ 9/4 = 9/4 ÷ 9/2 = 9/2 ÷ 9 = 9 ÷ 18 = 1/2