Hey, I was just wondering if there was an explicit expression for the sum of the first n fibbonaci numbers.

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- Jul 7th 2010, 05:50 PMChris11Sum of first n fibbonaci numbers
Hey, I was just wondering if there was an explicit expression for the sum of the first n fibbonaci numbers.

- Jul 7th 2010, 06:05 PMchiph588@
- Jul 7th 2010, 06:54 PMChris11
Thanks.

- Jul 7th 2010, 07:01 PMAlso sprach Zarathustra
Proof:

.

.

.

now add them... what you get?