Question

How do I find the common ratio of the sequence.

–80, –40, –20, –10, . . .

Answer 1

The current term over the previous term is the common ratio.

Answer 2

\(\Large \color{MidnightBlue}{\Rightarrow r = {r_n \over r_{n - 1}} }\)

Answer 3

in a GP, the first term is 'a'
2nd term is 'ar'
3rd term is 'a(r^2)'
and so on....nth term is
a[(r)^(n-1)]......
so clearly any term divided by its previous term wud give you the value of 'r'...r is the common ratio...

Answer 4

And I meant an not rn