Convergence of a Cauchy sequence

SANGHERA.JAS
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Since I don't know how to use latex I have posed my question in word file.
Yours help is greatly appreciated.
 

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If the author has already shown that the statement is equivalent to the statement including the absolute value of q (alone in the absolute value, nothing else with it) then to show it for q<0 would give the same result, as the absolute value would make q positive.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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