Show that the series converges

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SUMMARY

The discussion centers on proving the convergence of the series defined by the term a_n = (1/n)(1/2 + 2/3 + ... + n/(n+1)). Participants assert that while the left-hand side (LHS) series diverges, the term 1/n suggests convergence. To establish convergence, it is essential to demonstrate that the sequence is bounded above and increasing, which can be approached through the concept of Riemann sums. Clarifications regarding the nature of the series and its relation to Riemann sums are also provided.

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Homework Statement


The series is at http://img203.imageshack.us/i/snapshot1g.png/

The Attempt at a Solution



The LHS series diverges. However, the term 1/n seems to be make the series to converge.
However, I am not completely sure how to proceed in proving that the series converges.

I should first show that the series has a converging point.
Then I can show that the series converges.
 
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That isn't a series, it is a sequence.

a_n = \frac 1 n\left(\frac 1 2 + \frac 2 3 + ... + \frac n {n+1}\right)

One way to prove a sequence converges is to show it is bounded above and increasing. Try that.
 
Its a riemann sum.
 
^ Clever! I missed the obvious.

[/thread hijack]
 
Ratio Test =) said:
Its a riemann sum.

I don't think it's really a Riemann sum. The kth term is (k/n)/(k+1). If it were a Riemann sum, that would be a function only of (k/n).
 

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