Geometric progression

First term in the series (a) 
Last term in the series (n) 
Common difference (r) 
Description (-)
Geometric progression or sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed non-zero number called the common ratio. For example, the series 2, 6, 18, 54, ... is a geometric progression with common ratio 3.


Gp = a r (n-1)

a - first term in the series,
n - last term in the series,
r - common difference.
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