Observation and experimentation.
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Leonardo Fibonacci wrote about recreational mathematics, some of which involved number series such as the Fibonacci series that he is credited with discovering. * * * * * It is said that he was modelling rabbit population when he came up with the sequence that now bears his name. The rules are simple: 1. Rabbits that are one year old are juveniles and do not breed. 2. Each pair of rabbits aged two or more produce a pair of rabbit each year (forever!). 3. No rabbits ever die (what?). The whole process could apply to periods shorter than a year. Year 1: One pair of rabbits aged 0. Year 2: One pair of juvenile rabbits. Year 3: One pair of mature rabbits + One pair offspring aged 0 = 2 pairs Year 4: One pair mature + One pair offspring age 0 + One pair juvenile = 3 pairs Year 5: Two pair mature + One pair offspring age 0 + One pair juvenile + one pair offspring age 0 (from the newly mature) = 5 and so on. This model is a pretty poor descriptor for a rabbit population so I suspect it is not true. But makes an interesting exercise for young minds.
As much as the sentimental value of which you pair to it.
sometimes... usually poor Victorian families would have ONE pair of shoes which the whole family would wear E.G. they would take it in turns. If they did have a pair of their own shoes they would most probably home made.
They gave a breeding pair of Pandas, which were housed in the National Zoo in Washington, DC.
the are multiple forms of this question and there are different answers if it says Louis XVI and thousands of others are arrested and executed, Napoleon declares himself emperor of France. Then the answer is (1) The National Constituent Assembly proposes a new constitution. (2) French leaders end the Reign of Terror and condemn its leader