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Math Help - Probability question

  1. #1
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    Probability question

    The following was confusing me, so any help would be appreciated!

    Suppose we throw a fair coin 3 times. Let X be the number of heads. Find the probability distribution function of X.
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  2. #2
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    P(X) = {{3}\choose {X}} \left( {.5} \right)^3 ,\quad X = 0,1,2,3
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