What it is
In a Geometric Sequence each term is found by multiplying the previous term by a constant.
ex: 2, 4, 8, 16, 32, 64, 128, 256
This sequence has a factor of 2 between each number.
Each term (except the first term) is found by multiplying the previous term by 2.
Rule/equation
The rule for the geometric sequence is an=a1 (times) r (n-1)
n is the term you are trying to find
A1 is the first term
R is the common ratio
Example: 10, 30, 90, 270, 810, 2430.....
The value of A is 10 (the first term)
The value of 1 is 3 (the common ratio)
An= 10 (times) 3 (n-1)
A4 = 10×3(4-1) =
10×33 =
10×27 =
270