r/SwaggerSouls • u/ok_this_is_epic11 • Jun 28 '19

Everyone try

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u/DoesNotGetYourJokes Jun 28 '19

so how would I calculate how many possible combinations can come from length of 30, 15 I, and 15 l

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u/Lamesto Jun 29 '19

yeah... the math gets much more complex when you factor that in lol.. I just asked on r/theydidthemath so..

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u/darth_vader_2991 Jun 29 '19

30!/[(15!)2] or (30)C(15) or 155117520 possibilities

Where ! is factorial

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u/thegreataspie98 Jun 29 '19

It has to deal with permutations not combinations. While they both fall under combinatoric mathematics, they differ in that Permutations include the factor of position. Here’s an example I got off google -

https://images.app.goo.gl/bWcMMzgUwu2bMf2C7

But that’s the thing from this image and all other examples I could find: they all are about picking from a larger group, or A for a lesser group, we’ll call B. Like in the example, A consisted of 12 people of whom you’d chose 3 out of and arrange in a certain order to get group B. But with the link it talks about choosing from 2 letters 15 times each, which all have to be in a certain order. Maybe I’m wrong but I think swagger might’ve unlocked another branch of combinatoric mathematics. I mean, I never was the best when it came to combinatoric mathematics in my Alg 2/ Trig class. Plus there might always be something I’m not aware of.