taleek
taleek
08-04-2018
Mathematics
contestada
The sum of the series shown in the picture
Respuesta :
mkryukova19
mkryukova19
08-04-2018
partial sum of arithmetic series = n(a1+an)/2
a1=14
an=-280
an=a1+d(n-1), d=2-8=-6
-280=14-6(n-1)
-294=-6n+6
-300 = -6n
n=-300/(-6)=50
partial sum of arithmetic series = 50(14-280)/2=-6650
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