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What is the sum of the first 100 positive odd numbers?

Sagot :

[tex]a_1=1;\ a_2=3;\ a_3=5;\ ...;\ a_{100}=199\\\\S_n=\frac{a_1+a_n}{2}\times n\\\\S_{100}=\frac{1+199}{2}\times100=200\times50=\boxed{10,000}[/tex]
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