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 April 25th, 2019, 03:17 AM #1 Newbie   Joined: Apr 2019 From: Israel Posts: 1 Thanks: 0 Help is needed Hello, There is this question that I can't solve. Please help me many thanks question 30c.jpg
 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 $\dfrac{a_{n+1}}{a_n}<1,~\forall n$ Thanks from topsquark and Greens

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