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20 December, 11:09

What is the missing term in the geometric sequence?

-6,24,?,384,-1536, ...

?=

a.-204

b.-144

c.-96

d.-72

+2
Answers (1)
  1. 20 December, 13:25
    0
    Solution:

    formula : an=a1 (r) ^n-1

    n - number of term that is unknown

    a1 - first term

    r - second term divided by the first term

    a1=-6

    a2=24

    a3=?

    a4=384

    a5=-1536

    a3=-6 (24:-6) ^3-1

    a3=-6 (-4) ^2

    a3=-96

    therefore the 3rd term is - 96 (c)
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