Geometric progression Watch

ForbiddenOne
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Report Thread starter 8 years ago
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In a geometric progression , the ratio of the sum of the first 3 terms to the sum to infinity of the progression is 19:27 . Find common ratio .
Please help , i cant solve this
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JordanCracknell37
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Try expressing the information as a quotient and then it should simplify quite nicely.
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marcusmerehay
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Well you have a+ar+ar^2 = \frac{19}{27} \frac{a}{1-r}, so see what you can do with that.

Your answer should become:
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r^3 = \frac{8}{27} => r = \frac{2}{3}
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