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Math Help - checking my answers !! please have a look!!

  1. #1
    Newbie
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    Sep 2006
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    9

    checking my answers !! please have a look!!

    problem 1:
    A card is drawn at random from a standard deck of 52 cards. What is the probability
    of drawing
    (a) a king of spades?
    (b) a king?
    (c) not a king?
    (d) a diamond?
    (e) a face card (jack, queen, or king)?

    answer :
    a) 1/52
    b)4/52
    c)48/52
    d)12/52
    c)12/52

    second problem :
    It is believed that 2 genes A and B may play some part in the susceptibility of an
    individual to a disease. Of 100 patients investigated, 17 carry gene A, 33 carry gene
    B and 67 carry neither. Find the probability that a patient carries only gene A, only
    gene B or both.
    answer :
    i said if 67 patients don't have neither A or B, implies that 33 have wether A or B, and we know that 33 patient has gene B and 17 has A, which means the ones who only have gene B is 33-17=16. also 0 patients have only gene A. and then 17 has has both A and B!
    conclusion :
    probability of patient:
    with only gene A is 0
    with only B is 16/100
    with both is 17/100

    thanks a lot in advance!!
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  2. #2
    Junior Member
    Joined
    Oct 2006
    Posts
    43
    There are 13 diamonds. A23456789TJQK.
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  3. #3
    MHF Contributor Quick's Avatar
    Joined
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    New England
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    Your answers are right but DON'T FORGET TO SIMPLIFY!!!
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