The formula you are looking for is:
1+2+3+ ... +n = n(n+1)/2
-- Rick
--- adilelfahmi <adilelfahmi@yahoo.com> wrote:
> hey anyone knows formula for this:
> 1 to 2 equal 3
> 1 to 5 equal 15(1+2+3+4+5)
> etc.
> anyone have it?
> sorry if my english is bad, i'm indonesian
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> Yahoo! Groups Links
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>
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