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

User Eggdrop
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1 Answer

5 votes
this is an arithmetic series with common difference 6

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