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Summary

The Fibonacci sequence is a sequence of numbers in which each number is the sum of the two preceding ones, starting from 0 and 1. This is supported by
1
and.
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The sequence can also start from 1 and 1 or 1 and 2, as stated in.
1
Recurrence relation, Pascal's triangle and other related topics are also discussed in.
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According to

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Summaries from the best pages on the web

The Fibonacci Sequence is the series of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... The next number is found by adding up the two numbers…

Fibonacci Sequence - Math is Fun
mathsisfun.com

Summary
In mathematics, the Fibonacci numbers, commonly denoted Fn , form a sequence, the Fibonacci sequence, in which each number is the sum of the two preceding ones. The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes (as did Fibonacci) from 1 and 2. Starting from 0 and 1, the first few values in the sequence are:

Fibonacci number - Wikipedia
wikipedia.org

The Fibonacci numbers are the sequence of numbers {F_n}_(n=1)^infty defined by the linear recurrence equation F_n=F_(n-1)+F_(n-2) (1) with F_1=F_2=1. As a result of the definition (1), it is conventional to…

Fibonacci Number -- from Wolfram MathWorld
wolfram.com