Question

In a geometric series, each term is 21% less than the previous term. What is the value of r for this geometric series?

Answer 1

For a geometric sequence or geometric series, the common ratio is the ratio of a term to the previous term. This ratio is usually indicated by the variable r.

Example: The geometric series 3, 6, 12, 24, 48, . . . has common ratio r = 2.

Answer 2

In your geometric sequence, if its initial term were x, then the second term would be (x -.21x) or 79x.

The sequence would begin: x, .79x, ...

The common ratio is .79x / x = ? @15Twilight