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30-seconds-of-code/snippets/gcd.md
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---
title: gcd
tags: math,beginner
---
Calculates the greatest common divisor of a list of numbers.
Use `functools.reduce()` and `math.gcd()` over the given list.
```py
from functools import reduce
from math import gcd
def gcd(numbers):
return reduce(gcd, numbers)
```
```py
gcd([8, 36, 28]) # 4
```