Question 1190567
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r = common ratio


Let's ignore the first two terms.


The last two terms of the geometric progression (GP), aka geometric sequence, sum to 1.
a = second to last term
ar = last term


a+ar = 1
ar = 1-a
r = (1-a)/a


If we had 
a = 0.2
for instance, then it would mean,
r = (1-a)/a = (1-0.2)/0.2 = 0.8/0.2 = 4
ar = 0.2*4 = 0.8
a+ar = 0.2 + 0.8 = 1


Or we could have
a = 0.4
for instance, then it would mean
r = (1-a)/a = (1-0.4)/0.4 = 0.6/0.4 = 1.5
ar = 0.4*1.5 = 0.6
a+ar = 0.4 + 0.6 = 1


As you can see, these are two examples of having two terms of a geometric sequence add to 1. 
It turns out there are infinitely many ways to do this.


It doesn't matter what those two original first terms sum to (ie. it doesn't matter what x is)
The problem is effectively the same as asking "the sum of the first two terms of a GP is 1. What is the common ratio?"


In short, there are infinitely many possible solutions here. There isn't enough info to answer this current question.
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