re: Cashier at store told me one guy has spent $4000 on Powerball

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I would say each additional ticket increases your odds at a diminishing rate. Going from 1 to 2 doubles your odds. Going from 2 to 3 only increases your odds by 50%

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That is an interesting, albeit correct, way to describe it. The most important ticket you buy is the first one, and every ticket after that does increase your odds, but it does so at a slower and slower rate.