Re: [Math4u] formula

the answer is as follows
1+2+3+...........+n=n(n+1)/2
check for your problems.thank u

--- 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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