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Math Help - coins

  1. #1
    Newbie
    Joined
    Dec 2009
    Posts
    4

    Question coins

    I need help with this question:
    A fair coin is tossed four times. Compute the probability that the outcome is at least three tails.
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  2. #2
    Newbie
    Joined
    Dec 2009
    Posts
    9
    Think you posted in the wrong subforum, not really a university question?

    What have you tried so far?

    Some hints:
    1. What is the chance on this sequence: tail-tail-tail-head?
    2. Differs the answer from the previous question from: tail-head-tail-tail?
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