+0  
 
+1
81
2
avatar+9 
https://ibb.co/v1tycvN
 Dec 17, 2018
 #1
avatar+95177 
+2

Here is the question:

 

 Dec 17, 2018
 #2
avatar+27336 
+3

As follows:

 

 

Actually, there is no need for my equation (1).  Equation (2) shows that un is strictly less than 2 - √n for all n greater than or equal to zero. 

 Dec 17, 2018
edited by Alan  Dec 17, 2018
edited by Alan  Dec 17, 2018

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