∞∑n=1n3√8n5−1
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,n3√8n5−1≥n3√8n5=12n53−1=12n23
Now, use p-series to make conclusion that it diverges.
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