lyhourmath2019
lyhourmath2019 lyhourmath2019
  • 25-08-2020
  • Mathematics
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find sum of series: 1+2+3+...+n ​

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Аноним Аноним
  • 25-08-2020

Answer:

the sum of the this series is Sn = [n(n+1)] / 2

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