Therefore, the kth item at the end of the geometric series will be ar n-k. Assume that “r” and “a” are the common ratio and first term of a finite geometric sequence with n terms.This can be written as b = √ac or b 2 = ac If a, b, and c are three values in the Geometric Sequence, then “b” is the geometric mean of “c” and “a”.If there are 3 values in Geometric Progression, then the middle one is known as the geometric mean of the other two items.The geometric sequence formula to determine the sum of the first n terms of a Geometric progression is given by:. ![]()
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