Hi, this is a great forum which I've just joined, I'd suggest that we can benefit from some video tutorials posted on Youtube and then embedded here, this way people can find maths easier to understand..
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Occasionally people do post videos on all types of subjects.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.