![]() ![]() Where a is the first term in the sequence, r is the common ratio between the terms, and n is the number of terms in the sequence. To find the sum of a finite geometric sequence, use the following formula: For example, 1 + 3 + 9 + 27 + 81 = 121 is the sum of the first 5 terms of the geometric sequence. Geometric progression or sequence, is a sequence of numbers where each term after the first is found by multiplying the previous.
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