Note that Math::Big::factorial returns a Math::BigInt object, who have overloaded math operators doing integer arithmetic. Which means that $delta could be 0 or 1 (or some other integer), but not a value between 0 and 1.

Abigail

In reply to Re: Hypergeometric Probability Calculation by Abigail-II
in thread Hypergeometric Probability Calculation by Itatsumaki

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