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Probability question

  1. Oct 3, 2006 #1
    I am reviewing for a midterm and something I looked at before is confusing me. Can someone give me an explanation? If a sample space has events A1 A2, then the prob(A1 U A2)= prob (A1) + prob (A2) - prob (A1intA2). That makes perfect sense. If they are disjoint, then the union is just the sample space itself. Now if the events are independent of each other then the last term is the product of P(A1) and P(A2). But does this only refer to two seperate events? In other words you can't really use the independence within a sample space right? Does it have to be two events like one flip of a coin and then another flip?

    Thanks in advance
  2. jcsd
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