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

User CPerkins
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a_1=1;\ a_2=3;\ a_3=5;\ ...;\ a_(100)=199\\\\S_n=(a_1+a_n)/(2)* n\\\\S_(100)=(1+199)/(2)*100=200*50=\boxed{10,000}
User Nuby
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