![]() But after a few scant paragraphs on breeding rabbits, Leonardo of Pisa never mentioned the sequence again. "Liber Abaci" first introduced the sequence to the Western world. Read more: 9 equations that changed the world The answer, it turns out, is 144 - and the formula used to get to that answer is what's now known as the Fibonacci sequence. (Ignore the wildly improbable biology here.) After a year, how many rabbits would you have? A month later, those rabbits reproduce and out comes - you guessed it - another male and female, who also can mate after a month. After a month, they mature and produce a litter with another male and female rabbit. The problem goes as follows: Start with a male and a female rabbit. In one place in the book, Leonardo of Pisa introduces the sequence with a problem involving rabbits. Written for tradesmen, "Liber Abaci" laid out Hindu-Arabic arithmetic useful for tracking profits, losses, remaining loan balances and so on, he added. ![]() However, in 1202 Leonardo of Pisa published the massive tome "Liber Abaci," a mathematics "cookbook for how to do calculations," Devlin said. (Image credit: Stefano Bianchetti/Corbis via Getty Images) However, in 1202 in a massive tome, he introduces the sequence with a problem involving rabbits. Portrait of Leonardo Fibonacci, who was thought to have discovered the famous Fibonacci sequence.
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