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Question on Lottery Probabilities

  1. Jun 19, 2010 #1
    I have a question on the chances of winning a lottery: If you buy 10 tickets in a lottery where the odds of you winning are 30,000,000 to 1, is your probability of winning 1 in 3,000,000?
  2. jcsd
  3. Jun 19, 2010 #2
    Yes, pretty close. The odds are not the same as probabilities (p), but with these small odds, it doesn't make much difference. Odds are defined as p/1-p so 10:1 would be p = 0.1/0.9=0.11 In adding independent probabilities there's also a joint probability term that must be subtracted from the sum, but it's negligible in this case and can be ignored.
    Last edited: Jun 20, 2010
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