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If we keep calculating a sum of two preceding numbers we can get a set of numbers:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233 …
That set of numbers was introduced by an Italian mathematician known as as Leonardo Bonacci, Leonardo of Pisa, or Leonardo Fibonacci.
The best way to understand how this pattern works is to study collection of charts with real life examples.