>Does anyone know a simple formuala to do the following:
>
>1 = 1
>2 = 3 (1+2)
>3 = 6 (1+2+3)
>4 = 10 (1+2+3+4)
>5 = 15 (1+2+3+4+5)
>.
>.
>.
>
>
>So if given the number 5, the formula would return the total addition, 15. Thanks in advance for any ideas.
>
>Mat

From 1 to lnEnd (Gauss ?):
(lnEnd * (lnEnd+1)) / 2
Cetin