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Divide any term in the sequence by the previous term. That is the common ratio of a geometric series.
If the series is defined in the form of a recurrence relationship, it is even simpler.
For a geometric series with common ratio r, the recurrence relation is
Un+1 = r*Un for n = 1, 2, 3, ...
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Earn +20 ptsQ: How do you find the common ratio in a geometric sequence?
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