nrlsonjohnny13oxcwc1 nrlsonjohnny13oxcwc1

20-10-2017
Mathematics

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find the sum of the first 13 terms in the series -5+1+7...+67

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Аноним Аноним

20-10-2017

this is an arithmetic series with common difference 6

S13 = (13/2)[2*-5 + (13-1)*6)] = 403

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