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## #1 2013-02-05 14:13:41

ReallyConfused
Guest

### Fibonacci series

Is there any formulae for finding nth fibonacci series?

## #2 2013-02-05 14:55:15

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fibonacci series

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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## #3 2013-02-05 17:28:11

ReallyConfused
Guest

### Re: Fibonacci series

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)

## #4 2013-02-05 18:36:12

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fibonacci series

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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## #5 2013-02-05 18:55:36

ReallyConfused
Guest

### Re: Fibonacci series

Wow,that works perfectly ,why does it work?

## #6 2013-02-05 19:33:55

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fibonacci series

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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