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Probability (interesting)

  1. Sep 21, 2010 #1
    1. The problem statement, all variables and given/known data
    From 52 cards we draw one .Whats the probability that the drawn card is divisible by 4

    Now : in my notebook its 12/52=3/13 .But shouldn't it be 13/52 ? BECAUSE clearly if we multiply 13 *4=52

    Same problem : Whats the probability that of 52 cards I draw one that is divisible
    with 10 or 11 .In notebook its like this P(a)+p(b)= 4/52+4/52=8/52=4/26=2/13

    BUT shouldn't this as well be 5/52+5/52


    2. Relevant equations



    3. The attempt at a solution

    PLEASE just tell the correct answer every time I post here somebody argues about pointless stuff and leaves me hanging with no clue !!?!?

    Sorry second problem fixed so 4/52+5/52 is correct ?
     
    Last edited: Sep 21, 2010
  2. jcsd
  3. Sep 21, 2010 #2

    berkeman

    User Avatar

    Staff: Mentor

    On the first one, your book is correct that there are 12 cards in the deck that have a value that is divisible by 4. What cards of each suit have a value that is divisible by 4?
     
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