Geometric progression Calculator

Calculates the n-th term and sum of the geometric progression with the common ratio.

initial term a
common ratio r
number of terms n
    1. n=1,2,3...

the n-th term an
    1.  
sum Sn
    1.  
Geometric progression
[1-2] /2Disp-Num
BACK NEXT
[1]  2018/03/17 07:43   Female / Under 20 years old / High-school/ University/ Grad student / Not at All /
Purpose of use
I was looking for a calculator to find the common ratio of a sequence when given the first 3 numbers of that sequence. I can''t seem to find one of those...
[2]  2013/03/23 03:56   Male / 50 years old level / Others / A little /
Purpose of use
Von Neumann probe estimate. 400 billion stars in the galaxy, how many iterations before a reproducing probe produces a number equivalent to one probe per star. Assume original probe produces 1 per month until T is reached. Every probe after that does the same once its arrived. Average travel time between stars assume 50 years.

BACK NEXT

Thank you for your questionnaire.
Sending completion

Back

To improve this 'Geometric progression Calculator', please fill in questionnaire.
Male or Female ?
Male Female
Age
Under 20 years old 20 years old level 30 years old level
40 years old level 50 years old level 60 years old level or over
Occupation
Elementary school/ Junior high-school student
High-school/ University/ Grad student A homemaker An office worker / A public employee
Self-employed people An engineer A teacher / A researcher
A retired person Others
Useful?
Very Useful A little Not at All
Purpose of use?
Comment/Request (Click here to report a bug).Bug report (Click here to report questionnaire.)
Calculation bug(Please enter information such as specific input values, calculation result, correct result, and reference materials (URL and documents).)
Text bug(Please enter information such as wrong and correct texts)
Your feedback and comments may be posted as customer voice.
送信