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Two Factorials

Two Factorials

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In probability solving factorials video, it mentioned how to calculate n>k. How about n<k, is there any formula we can use? Also, what is k stand for?

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365 Team
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Hey Kam,
Thanks for reaching out!
So, we’re introducing factorials because people might not be familiar with the notation. Additionally, we wanted to show what (n+k)! and (n-k)! factorial looks like (where k is just another number like 1, or 4). We also wanted to show what dividing factorials by one another results in, so we displayed n!/k! here.
 
How about n<k, is there any formula we can use? 
Then, we’d just have the same result, as n!/k!, but it would be in the denominator, rather than the numerator.
 
Also, what is k stand for?
We’re explaining the algebraic properties of integrals here, so k can be anything we want. In this case, it’s just a constant number.
 
Best,
365 Vik

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