[issue35431] Add a function for computing binomial coefficients to the math module

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

@David Ratcliffe

> the sum of the first n positive integers is binomial(n+1, 2), and the formula should still work if n is zero.

I agree that's a convincing use-case.

Can you think of any practical uses for allowing negative `k`? I can't.

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