[issue35431] The math module should provide a function for computing binomial coefficients

[kellerfuchs]

kellerfuchs <kellerfuchs at hashbang.sh> added the comment:

@Steven D'Aprano:
> all call this nCr, and nPr for the permutation version. This matches 
> the notation taught in secondary school maths classes in Australia. 
> That's common and familiar notation for secondary school students, but 
> personally I'm not super-keen on it.

It's also not universal; in my experience, most calculators are localized for a given market, and may use different notations (in particular, the notation for combinations/binomial numbers changes across countries).

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<https://bugs.python.org/issue35431>
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