The Sum Of The First n Terms Of A Geometric Progression Definitions

S_n= a(1-rⁿ)/(1-r)

S_n = a + ar +ar²+ ar³.....+ar^n-1 or the sum of the first n terms.

r is the common multiple among the consecutive terms of a geometric progression.

a is the first term of the sequence.

n is the number of consecutive terms for which you are trying to solve.