GEOMETRIC SEQUENCE

is one where to get from one term to the next you multipy by the same number of each time this number is called common ratio.

RATIO OF CONSECUTIVE TERMS IS CONSTANT CALLED "COMMON RATIO"

EXAMPLE: 1,3,9,27,81,... ratio is 3

Sn=a1(1-rn) over 1-r

WHERE :SN= the sum , a1= the first termn= number of terms and r=common ratio