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Compute the sum 1+4+7+10+...100+103

 Aug 9, 2020
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First we find the number of terms which is (103-1)/3+1=102/3+1=34+1=35. Now notice that every pair adds up to 103+1=104. So the sum is 104(35)/2=1820.

 Aug 9, 2020

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