Arithmetic & Geometric Sequences
Arithmetic formula: an= a1 (n + 1) d
Geometric formula: an= a1* r (n-1)
Example: -9, 3, -1, 1/3, 1/9
This is a geometric sequence.
To find the term in a geometric sequence multiply or divide the previous term by “r”.
-9, 3, -1, 1/3, 1/9 r= -1/3
5, -10, 20, -40 r= -2
-10 20 -40
5 -10 20
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