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Homework Help: Statistic Help THANKS

  1. Jan 21, 2008 #1
    Statistic Help!!!THANKS!!!!

    Consider the trial on which a 3 is first observed in successive rolls of a four-sided die. Let A be the event that 3 is observed on the first trial. Let B be the event that at least two trials are required to observed a 3. assuming that each side has probability 1/4. find (a)P(A) (b)P(B),and (c) P(A U B)

    I think the S={1,2,3,4} and event A={3}, but i was confuse with the event B.

    (a) P(A)=1-P(A')=1-3/4=1/4

    But since i don't know event B, i can't do the rest of problem.
    Last edited: Jan 21, 2008
  2. jcsd
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