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binomial(n, k) for n < 0 #56

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ronnodas opened this issue Dec 9, 2023 · 0 comments
Open

binomial(n, k) for n < 0 #56

ronnodas opened this issue Dec 9, 2023 · 0 comments

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@ronnodas
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ronnodas commented Dec 9, 2023

This would be a breaking change either way, but binomial(n, k) with n < 0 should either produce (-1).pow(k) * binomial(k - n - 1, k) = n(n-1)...(n-k +1)/k! or n and k should be unsigned. See eg https://en.wikipedia.org/wiki/Binomial_coefficient#Generalization_and_connection_to_the_binomial_series.
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