To find the sum of the first S n terms of a geometric sequence use the formula S n = a 1 (1 − r n) 1 − r, r ≠ 1, where n is the number of terms, a 1 is the first term and r is the common ratio. The sum of the first n terms of a geometric sequence is called geometric series.
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To find the sum of the first S n terms of a geometric sequence use the formula S n = a 1 (1 − r n) 1 − r, r ≠ 1, where n is the number of terms, a 1 is the first term and r is the common ratio. The sum of the first n terms of a geometric sequence is called geometric series.