CBSE Class 11 Maths Notes: Sequences & Series – Geometric Progression

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, ar², . . . 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 to Go Back to CBSE Class 11 Maths Sequences and Series All Topic Notes

Click Here for CBSE Class 11 Maths All Chapters Notes