A progression of numbers in which every term bears a constant ratio with its preceding term, is called a geometrical progression. The constant ratio is called the common ratio of the G.P. A G.P. with first term a and common ratio r is : a, ar, ar^{2}, In this G.P. T_{n} = ar^{n-1} sum of the n terms, Sn= a(1-r^{n})/(1-r)

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A progression of numbers in which every term bears a constant ratio with its preceding term, is called a geometrical progression.

The constant ratio is called the common ratio of the G.P. A G.P. with first term a and common ratio r is :

a, ar, ar

^{2},In this G.P. T

_{n}= ar^{n-1}sum of the n terms, Sn= a(1-r

^{n})/(1-r)