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zhenek [66]
3 years ago
15

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

Mathematics
1 answer:
valentinak56 [21]3 years ago
5 0
This is an arithmetic series with common difference 6 

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