5 + 8 = 13
|Smokestack in Turku, Finland|
This problem was studied and solved by a famous mathematician,
Fibonacci. The numbers of rabbits form the Fibonacci series.
This series has important applications in several problems
that have nothing to do with rabbits.
Call the N'th number in the series
Here is the rule for filling the chart, rewritten for
fib( N ) = fib( N-1 ) + fib( N-2 )
Look at the chart to verify that the rule works.