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mathmate

The sum of integers n from n1 to n2 is given by the Gauss formula


[tex]\sum_{k=n1}^{n2}k=(n2-n1+1)\frac{n2+n1}{2}[/tex]

[tex]=(8-1+1)\frac{8+1}{2}[/tex]

[tex]=(8)\frac{9}{2}[/tex]

=36

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