Mathematics, 14.09.2019 08:30 autumnkiewel200
Find the sum of the whole numbers from 1 to 720
Answers: 3
![S_n=\frac{n}{2}[a+l]](/tpl/images/0231/1203/07c77.png)
![S_{720}=\frac{720}{2}[1+720]](/tpl/images/0231/1203/ea9f1.png)
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