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

02-01-2018

Sn = n/2 (a1+an)
= 8/2 (3-38)
= 4 (-35)
= -140

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