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GJGCA

(123 posts)
8. Subfactorial says...
Fri Sep 19, 2025, 03:24 PM
Sep 19

In mathematics, an exclamation mark placed before an integer, like (!5), denotes a subfactorial. 

The subfactorial of (0) is (1), which is expressed as !0=1.

Ergo: 1 million dollars donation...?

Wikipedia: https://en.m.wikipedia.org/wiki/Derangement

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