Say you want to know how fast rabbits reproduce. Let’s make it simple with some assumptions:
1. start with a single newly born pair of rabbits
2. rabbits are able to mate at the age of one month, so at the end of its second month a female can produce another pair of rabbits
3. rabbits never die and a mating pair always produces a new pair every month
Together these rules produce the Fibonacci numbers.
1 (baby pair of rabbits)
1 (mating pair of rabbits)
2 (original mating pair + newborn pair makes 2 pairs)
3 (2 pairs from before + another newborn pair)
5 (3 pairs from before + 2 newborn pairs as another pair is having kids and original)
[The Fibonacci numbers are exactly the number of rabbit pairs each period.](https://mathcenter.oxford.emory.edu/site/math125/fibonacciRabbits/)
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