nrlsonjohnny13oxcwc1
nrlsonjohnny13oxcwc1 nrlsonjohnny13oxcwc1
  • 20-10-2017
  • Mathematics
contestada

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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