![]() 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. Each term (except the first term) is found by multiplying the previous term by 2. Geometric sequences are formed by choosing a starting value and generating each subsequent value by multiplying the previous value by some constant called the. This sequence has a factor of 2 between each number. For example, sequences 2, 6, 18, 54, is a geometric sequence. Geometric Sequences In a Geometric Sequence each term is found by multiplying the previous term by a constant.
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