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**[SOLVED] Summation - Riemann Intergral - URGENT**

## Homework Statement

Im working on the upper and lower riemann sums of f(x) = exp(-x)

where Pn donates the partition of [0,1] into n subintervals of equal length (so that Pn = {0,1/n,2/n,....,1})

## Homework Equations

## The Attempt at a Solution

So far i have the upper sum to be the sum from i=1 to n of exp(-i/n)/n - is this right? - if so where do i go from here? I think im meant to take the limit when n-> infin which should give the final upper sum. I hope this right...