Before knowing the formula for a geometric series, let us recall what is a geometric series. It is a series where the ratios of every two consecutive terms are the same. The formulas for a geometric series include:
Formula to find the nth term of a geometric sequence.
Finding the sum of a finite geometric series.
Finding the sum of an infinite geometric series.
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The formulas for a geometric series include the formulas to find the nth term, the sum of n terms, and the sum of infinite terms. Let us consider a geometric series whose first term is a and common ratio is r.