berggirls4 berggirls4
  • 01-08-2018
  • Mathematics
contestada

Which summation formula represents the series below?

Which summation formula represents the series below class=

Respuesta :

rejkjavik rejkjavik
  • 01-08-2018

we are given

[tex] 12-24+48-96 [/tex]

we can see that

total number of terms is 4

so, n=4

first term is 12

[tex] a_1=12 [/tex]

[tex] a_2=-24 [/tex]

now, we can find common ratio

[tex] r=\frac{-24}{12} [/tex]

[tex] r=-2 [/tex]

now, we can find nth term

[tex] a_n=a_1 (r)^{n-1} [/tex]

[tex] a_n=12 (-2)^{n-1} [/tex]

so,

option-B.........Answer

Answer Link
kaidenstollenwerck1 kaidenstollenwerck1
  • 03-03-2022

Answer:

12 - 24 + 48 - 96 = -160

Step-by-step explanation:

12 - 24 = -12

-12 + 48 = 36

36 - 96 = -60

Answer Link

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