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This is not my best video on this. I just remade it after I had enough people tell me to do so. Here is the link to a much longer version of this video with lots more examples and explanations!!!!! youtu.be/OXBHFBi70MM I do have two videos that go into permutation and combination separately and I spend time explaining them with simpler examples. This video should really be watched after those two. Im not sure why this one is so popular. Here is the combination vid youtu.be/y86RmzsX3C4 and here is the permutation video youtu.be/yacYGEIic4c. How to tell the difference between a permutation and a combination. Here are several examples that will help you understand the difference.