whatRthose whatRthose

26-05-2016
Mathematics

Answered

What is the missing term in the geometric sequence?

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

?=

a.-204

b.-144

c.-96

d.-72

Verified Answer :

windbust windbust

26-05-2016

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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