laurenosborn
laurenosborn laurenosborn
  • 24-04-2017
  • Mathematics
contestada

Someone please help me find the sum of these geometric series!!
Thank you so much

Someone please help me find the sum of these geometric series Thank you so much class=
Someone please help me find the sum of these geometric series Thank you so much class=

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 25-04-2017
sum of aritmetic sqeuqnece is
(n/2)(a1+an)
a1=first term
an=nth term
n=how many terms

so we gots
a1=3(1)-4=-1
a18=50
n=18
(18/2)(-1+50)
(9)(49)
441


other one
a1(1-r^(n+1))/(1-r)

2(1-2^(15+1))/(1-(1/4))
 about 2 and 2/3, so closer to 3
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