If the common ratio of an infinite geometric series is less than or equal to -1, or greater than or equal to 1, the sum of the series does not exist. However, it's possible to find a partial sum, or the sum of the first several terms in the series. The partial series can be thought of as a finite series. Thus, its sum can be found using the formula for a finite geometric series.
Sn=1−ra1(1−rn)
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