# math

posted by .

what is the common ratio for this geometric series?

15
11
7
3
.5

• math -

The sequence

15,11,7,3,.5

is not geometric. The ratio between terms is not constant

11/15 ≠ 7/11 ≠ 3/7 ≠ .5/3

## Similar Questions

1. ### CALC II

Determine the convergence of the following series using the nth-partial sum or geometric series formula. The sum of n=1 to inifitiy 1/(9n^2+3n-2) How do I start?
2. ### math studies

An arithmetic series has a first term of -4 and a common difference of 1. A geometric series has a first term of 8 and a common ratio of 0.5. After how many terms does the sum of the arithmetic series exceed the sum of the geometric …
3. ### Geometric Series (Algebra 2)

I need some assistance or a formula when trying to find the first term of geometric series please! I don't understand this!!!! What is the first term of a geometric series with a summation of 289, 5 terms and a common ratio of 1/2?
4. ### Algebra

Is the series 72, 48, 32,... an arithmetic or geometric series. WHat is common difference or ratio
5. ### Math(arithmetic & Geometric Series)

1)The sum of 6 terms of an arithmetic series is 45, the sum of 12 terms is -8. Find the first term and the common difference?
6. ### Pre-Calculus

Q.Determine the sum of each infinite geometric series. t_1= 8 r = -2^1/2 ---------------------------------------- A.This is a divergent series because the absolute value of r is greater than 1. ---------------------------------------- …
7. ### pre-calculus urgent

Please help me here as well to clarify more my understanding. Let a1, a2, a3, . . . be a geometric sequence with initial term a and common ratio r. Show that a1^2, a2^2, a3^2, . . . is also a geometric sequence by finding its common …
8. ### math(geometric series)

the common ratio of the infinite geometric series whose 2nd term is 3/2 and its sum is 8?
9. ### math C2 sequences and series

The eight,fourth and second terms of an arithmetic progression form the first three terms of a geometric series. The arithmetic progression has first term A and common difference d, and the geometric progression has first term G and …
10. ### algebra, series

The sum of the first n terms of a series is 1-(3/4). Obtain an expression for the nth term of the series. Prove that the series is geometric, and state the values of the first term and the common ratio. Please show workings

More Similar Questions