The sum of the first n Fibonacci numbers

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Science mathematics fibonacci fibonacci numbers sum identity

Episode 20.

The sum of the first n Fibonacci numbers.
The sum of the first n Fibonacci numbers is equal to the (n+2)-th Fibonacci number minus 1. $f_1 + \ldots + f_n = f_{n+2} - 1$.

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https://youtu.be/JB-5zhKVNmo

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