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Fibonacci Rabbits

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In 1202 Fibonacci investigated how fast rabbits could breed.

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Suppose a pair of rabbits, one male and one female, start a family. Rabbits mature at the age of one month (labeled "m") and a female produces a new pair of rabbits (labeled "n") at the end of its second month.

Suppose that the rabbits survive forever and that a female always produces one new pair (one male, one female) every month, giving the original pair and a new one.

How many pairs will there be in eight generations?

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Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA

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The sequence can be reproduced by a substitution system, replacing every "m" in one month by "mn" in the next and similarly replacing every "n" by "m".

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