https://www.youtube.com/embed/vKA4w2O61Xo

Can you figure out the rule?

How do you investigate hypotheses? Do you seek to confirm your theory – looking for white swans? Or do you try to find black swans?  It is hard  for people to investigate number sets that didn’t follow their hypotheses, even when their method wasn’t getting them anywhere. Just because you have only seen white swans, doesn’t mean black ones exist!!