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Homework Help: Simple probability

  1. Jun 22, 2014 #1

    benorin

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    Homework Helper

    1. The problem statement, all variables and given/known data
    Suppose u have a deck composed of 4 aces and 2 kings. Find P(exactly 3 aces when u draw 3 cards), P(exactly 1 king and 2 aces when u draw 3 cards), and P(exactly 2 kings and 1 ace when u draw 3 cards).


    2. Relevant equations



    3. The attempt at a solution
    P(exactly 3 aces when u draw 3 cards)=4/6*3/5*2/4=1/5
     
  2. jcsd
  3. Jun 22, 2014 #2

    adjacent

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    Gold Member

    You do the same thing for (exactly 1 king and 2 aces when u draw 3 cards) and (exactly 2 kings and 1 ace when u draw 3 cards). However, you will have to consider the order of taking kings and aces. You will need Or rule too.
    Drawing a tree diagram is very helpful
     
    Last edited: Jun 22, 2014
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