Dear Roslina,
For $m \rightarrow  \infty$ that sum is exp(1)-1:

> options(digits=20)
> exp(1)-1
[1] 1.718281828459045
> m<-20
> sum(1/factorial(1:20))
[1] 1.718281828459045

HTH,

Jorge


On Wed, Mar 25, 2009 at 8:43 PM, Roslina Zakaria <zroslina@yahoo.com> wrote:

>
> Hi r-users,
>
> How do we evaluate the summation of (1/m!) from 0 to infinity (for
> example).
>
> Any help is very much appreciated.
>
> Thank you.
>
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>

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