Saturday, May 13, 2017

Does the series sumin=1nftyfracnsqrt[3]8n51 Converge?


n=1n38n51


From the tests that I know of:


Divergence Test: The limit is ≠ to a constant, so inconclusive.


Geometric series: I don't think this could be written in that manner.


Comparison Test/Lim Comparison: Compare to n8n53


Integral Test: I can't think of a integration method that would work here.


Alternating Series/Root Test don't apply.


Ratio Test: The limit is 1 so inconclusive.


Perhaps I'm making a mistake throughout the methods I've tried, but I'm lost. Using these tests, is it possible to find whether or not it converges or diverges?



Answer



Use comparison test,n38n51n38n5=12n531=12n23


Now, use p-series to make conclusion that it diverges.


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