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April 25th, 2019, 03:17 AM   #1
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Help is needed

Hello,
There is this question that I can't solve.
Please help me
many thanks question 30c.jpg
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April 25th, 2019, 08:34 AM   #2
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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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