Added Combinations and Permutations in the Probability Section

Hey math humans!

So Probability isn’t my favorite part of math, but it typically can’t be avoided..

I attempted to create some tables that address more advanced Probability problems than I previously had; please take a look and see if things look right. That would be awesome!

Here is the Probability section where I go into more detail about combinations and permutations; please take a look

Lisa