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# Fibonacci numbers

## Problem Statement

Write a function to calculate the nth Fibonacci number.

Fibonacci numbers are a series of numbers in which each number is the sum of the two preceding numbers. First few Fibonacci numbers are: 0, 1, 1, 2, 3, 5, 8, ...

Mathematically we can define the Fibonacci numbers as:

`Fib(n) = Fib(n-1) + Fib(n-2), for n > 1 Given that: Fib(0) = 0, and Fib(1) = 1`

**Constraints:**

`0 <= n <= 30`

## Try it yourself

Try solving this question here:

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