kyleescott6148 kyleescott6148
  • 02-01-2018
  • Mathematics
contestada

What is sn for the arithmetic series with a1=3 an=-38 and n=8?

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anchitthawi
anchitthawi anchitthawi
  • 02-01-2018
Sn = n/2 (a1+an)
= 8/2 (3-38)
= 4 (-35)
= -140
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