Submitted by Sean Wingert on Tue, 10/20/2015 - 11:09

I've been working on basic Algebra II concepts recently, especially tree diagrams for combinations and permutations. Permutations are relatively straightforward, but not combinations. So, I asked a question on Math.StackExchange.com, and although I never received a response, I think that my sketch, shown below, is roughly accurate:

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