Add links to zh-CN version of Factorial.

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Oleksii Trekhleb
2018-12-28 16:35:54 +02:00
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# Factorial
_Read this in other languages:_
[_简体中文_](README.zh-CN.md),
In mathematics, the factorial of a non-negative integer `n`,
denoted by `n!`, is the product of all positive integers less
than or equal to `n`. For example: