**GEOMETRIC PROGRESSION (G.P.)**

A G.P. is a sequence whose first term is non-zero and each of whose succeeding term is r times the preceding term, where r is some fixed non – zero number, known as the common ratio of

the G.P. For example 3 + 9 + 27 + 81 is a G.P. whose common ratio is 3.

**n ^{th} Term and Sum of n Terms:**

If a is the first term and r the common ratio, then G.P. can be written as a, ar, ar^{2}, . . . the nth term, a_{n}, is given by a_{n} = ar^{n-1}. The sum S_{n} of the first n terms of the G.P. is

« Click Here for Previous Topic | Click Here for Next Topic » |

CBSE Class 11 Maths Sequences and Series All Topic Notes CBSE Class 11 Maths All Chapters Notes

To get fastest exam alerts and government job alerts in India, join our Telegram channel.

## Discussion about this post