If you have a lottery (Megamillions) and you sell 20,000,000 tickets, the probability of them all losing is given by:(adsbygoogle = window.adsbygoogle || []).push({});

(135,145,919/135,145,920)^20,000,000 = 0.862448363

A close approximation is given by:

e^-(20,000,000/135,145,920) = 0.8624413

I just learned this from a book. That's pretty cool!

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# The Poisson distribution

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