在这段视频中，接受试验的是三位男士和三位女士—一半的人穿着白衬衫，一半着黑衬衫，他们互相传递几个篮球。

In the video, six men and women — half with white shirts and half with black — are tossing around a couple of basketballs.

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Well, suppose there were 5 billion people Roughly half of them are men half of them are women What we want to know then is how many possible people could the 2 5 billion men make altogether ? with the 2 5 billion women?

假设这有50亿人,非常粗糙地分为一半男,一半女,我们下面想知道的是,25亿男人和,25亿女人总共在一起,能制造多少可能的人？

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