izzyCa6Marlet izzyCa6Marlet

27-05-2016
Mathematics

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What is the sum of the first 22 terms of the following series?

86 + 79+ 72 + 65 + 58 +...

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Аноним Аноним

27-05-2016

S22 = (86*2+(79-86)*(22-1))*22/2 = 275

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