geometric series

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A series of numbers or terms in which the ratio of any term to the subsequent term is constant. For example, 1, 4, 16, 64, 256,… has a common ratio of 4. In general, a geometric series can be written:

a + ar + ar2+… + arn−1

and the sum of n terms is:

a(rn − 1)/(r − 1).

Subjects: Biological Sciences — Mathematics.

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