Posted by **Nelly** on Thursday, February 24, 2011 at 7:06am.

How to write an algorithm to find the fibonacci series ???

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**MathMate**, Thursday, February 24, 2011 at 8:48am
The fibonacci series is defined as the set of terms a(n)∈Z+ (i.e. all terms are integers) such that:

a(0)=0

a(1)=1

a(i)=a(i-2)+a(i-1), i≥2

The pseudocode resembles a lot the definition of the series:

Input: n

a(0)=0

a(1)=1

for i=2,i<=n,i++: a(i)=a(i-2)+a(i-1) next

return a(n)

Note that a closed form formula for evaluating a(n) exists, and is called the Binet's formula:

a(n)=((p^n-(-1/p)^n)/sqrt(5)

where p=(1+sqrt(5))/2 = the golden ratio

However, since the result has to be an integer, and the calculations required are real, there could be rounding problems with calculations performed on a digital computer, unless symbolic algebra is available.

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