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What is 1+2+3...20000+20001+20002=?

 Jan 7, 2022
 #1
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[20,002  x  20,003] / 2 ==200,050,003

 Jan 7, 2022
 #2
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\(S_n=\frac{n}{2}(a+L) = \frac{20002}{2}(1+20002)=10001*20003 = 200\;050\;003\)

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 Jan 8, 2022

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