Question

Find the common ratio of the gemetric sequence -320, 80, -20, 5

Answer 1

Given that :-

Geometric sequence → -320,80,-20,5

To find :-

Common ratio .

Solution :-

Common ratio = ar/a

→ Here a = -320

→ ar = 80

→ Common ratio = 80/-320

• → Common ratio = -1/4

Let's check it →

Taking a = 80 and ar = -20

→ Common ratio = -20/80

• → Common ratio = -1/4

So common ratio will be -1/4

Answer 2

- 0.25

Explanation:

Common ratio

`r = (succeeding \: term)/(preceding \: term) \\ = (80)/( - 320) \\ = - (1)/(4) \\ = - 0.25`