SOLUTION: Find the common ratio when a2 = 64 and a5 = 8.

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Question 977412: Find the common ratio when a2 = 64 and a5 = 8.
Answer by anand429(138) About Me  (Show Source):
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As per standard GP notation
a*r = a =64 -(i)
and,
a*r^4 = a5 = 8 -(ii)
Dividing (ii) by (i)
r^3 = 1/8
i.e. r = 1/2