Question

What is the common ratio of the sequence?
-2,6,-18,54​

Answer 1

Answer: Common ratio is -3

Explanation:

Given series is geometric progression series : -2,6,-18,54​..

Also, General geometric progression series is represented as a,ar,a
`r^(2)`,a
`r^(3)`......

In order to find common ratio r, we will take ratio of second and first term

=
`(ar^(2))/(a)`

=
`(+6)/(-2)`

=-3

Correct answer is -3