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

Solution:

The geometric series formula refers to the formula that gives the sum of a finite geometric sequence, the sum of an infinite geometric series, and the nth term of a geometric sequence.

The given sequence is -2, 6, -18, 54

In order to get the common ratio, we need to divide the preceding term with the previous term

Let the common ratio be ‘r’

r = preceding term/previous term

r = 6/-2

r = -3

Therefore, the common ratio is -3.

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

Summary:

The common ratio of the sequence -2, 6, -18, 54 ….. is -3.