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A geometric series has first term x and last term x^2. Its sum is x^3. What is its common ratio?
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If you know that the sequence is geometric, you can choose any one term in the sequence and divide it by the previous term to find the common ratio.
Each term of a geometric sequence increases or decreases by a constant factor called the common ratio.
a_{n}=a*r^{n-1}.
a_{n}=r*a_{n-1} for every integer n >= 1.
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