Let-the-first-term-and-the-common-ratio-of-a-geometric-sequence-a-n-be-1-and-r-If-a-n-satisfy-a-n-1-a-1-a-n-a-1-for-all-n-2-find-the-range-of-values-of-r-

Question Number 108805 by ZiYangLee last updated on 19/Aug/20

Let the first term and the common

ratio of a geometric sequence {a_{n}} be 1

and r .

If {a_{n}} satisfy ∣ a_{n - 1} - a_{1} ∣⩽∣ a_{n} - a_{1} ∣ for

all n ⩾ 2, find the range of values of r .