RSS Feedsecure_iconYou are currently using a secure connection

An Arithmetic Geometric sequence

Problem 235

Published on Saturday, 7th March 2009, 05:00 am; Solved by 3511; Difficulty rating: 40%

Given is the arithmetic-geometric sequence u(k) = (900-3k)rk-1.
Let s(n) = Σ

Find the value of r for which s(5000) = -600,000,000,000.

Give your answer rounded to 12 places behind the decimal point.