Before going learn the geometric sum formula, let us recall what is a geometric sequence. A geometric sequence is a sequence where every term has a constant ratio to its preceding term. A geometric sequence with the first term a and the common ratio r and has a finite number of terms is commonly represented as a, ar, ar2, ..., arn-1. A geometric sum is the sum of the terms in the geometric sequence. The geometric sum formula is used to calculate the sum of the terms in the geometric sequence.
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