Asked by Akintunde

The sum of the first three terms of a G.P is 7/8 of the sum to infinity .Find the common ratio.
Answered by Steve
a(1-r^3)/(1-r) = 7/8 * a/(1-r)
1-r^3 = 7/8
r^3 = 1/8
r = 1/2
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