How many possible BTS fan-ship configurations are there?

Subscriber Count: 248 Joke video with serious mathematics. I attempt to explain basic concepts in the solution of counting problems such as the factorial function in a fairly intuitive way. These concepts are applied to this real-life situation I came up with in a conversation with friends on a related topic: i.e., people setting up fictional pairings-up of their favourite Korean boy/girl bands. (Note again that I am not a fan of the K-pop industry or the practice of fan-shipping; if you are curious as to why, then feel free to leave a comment or e-mail me at the address on my about page! I won't get into any arguments, though.)