amberjarvis90 amberjarvis90

22-09-2016
Mathematics

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The first two terms of a geometric sequence are a1 = 1/3 and a2 = 1/6. What is a8, the eighth term?

A. 1/384
B. 1/128
C. 1/768
D. 1/256

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FriendToDino FriendToDino

22-09-2016

a1=1/3
a2 = 1/6
The constant factor is 1/2
a1=2/3*1/2
a2=2/3*1/2^2
So ...
a8=2/3*(1/2)^8
2/3*1/256
A. 1/384

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