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Katherine Xue

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Science Column: You Two? That’s My Birthday

By Katherine Xue October 26, 2012

Here are three questions for your weekend reflections. Number one: how many people would it take to build a human pyramid 22 layers tall? Number two: if 23 people in a room shake hands with everyone else exactly once, how many handshakes take place? Number three: what’s the chance that two of those 23 people have the same birthday?

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