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SUBMIT YOUR IDEAIt's funny how the solution itself didn't take that much time, but I did a simple mistake in 1 formula and it took me a while to figure it out. I even started to draw the formula's logic to understand why it doesn't work.
Anyway, here is my solution 🙂
Tried to build the factorial 1 case into the normal path but gave up and just gave it a separate path.
Quick one