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**ReallyConfused****Guest**

Is there any formulae for finding nth fibonacci series?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,163

Hi;

Welcome to the forum. There simplest is called the Binet formula.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**ReallyConfused****Guest**

Thank you but that formulae is for nth fibonacci number,i want a formula for the sum of fibonacci numbers from 1st to nth fibonacci number(nth series)

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,163

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**ReallyConfused****Guest**

Wow,that works perfectly ,why does it work?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,163

Hi;

http://en.wikipedia.org/wiki/Fibonacci_number

About 1 / 3 down the page there is an explanation for how to do the sum by grouping.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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