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From Dale Erwin <d...@casaerwin.org>
Subject Re: Calc: Easy way to do N+(N-1)+(N-2)+(N-3)..(N-N+1)
Date Fri, 21 Jun 2013 21:01:09 GMT
I don't think that n can be zero.

Dale Erwin
Jr. 28 de Julio 657, Depto. 03
Magdalena del Mar, Lima 17 PERU
http://leather.casaerwin.org

On 6/21/2013 1:37 PM, Brian Barker wrote:
> At 18:27 21/06/2013 +0000, Jonathon 'Toki' Kantoor wrote:
>> Is there a formula, extension, or something in calc that enables one 
>> to calculate the sum of 1..N, where N is an integer between 0 and 100 
>> 000 000?
>
> Yes.  Sigma (1 to n) is n(n+1)/2.
>
>> If so, what is the formula, extension, or something?
>
> =Xn*(Xn+1)/2
>
> I trust this helps.
>
> Brian Barker


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