April 25th, 2019, 03:17 AM  #1 
Newbie Joined: Apr 2019 From: Israel Posts: 1 Thanks: 0  Help is needed 
April 25th, 2019, 08:34 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,552 Thanks: 1402 
I don't see how it's possible for this positive series to be simultaneously monotonically decreasing and yet be that $\lim \limits_{n\to \infty}\left(\dfrac{a_{n+1}}{a_n}\right)=5$ If it's monotonically decreasing $\dfrac{a_{n+1}}{a_n}<1,~\forall n$ 

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