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Math Help - Probabilty issues..

  1. #1
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    Probabilty issues..

    Of 7 kittens in a litter, 4 have stripes. Three kittens are picked at random. Find the odds of each event.
    1) All three have stripes.
    2) Only 1 has stripes.
    3) One is not striped.
    I am just...utterly stuck. I tried doing 4 CR 3/7 CR 4 for the first one, but that's apparently not correct..
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  2. #2
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    Quote Originally Posted by puzzledwithpolynomials View Post
    Of 7 kittens in a litter, 4 have stripes. Three kittens are picked at random. Find the odds of each event.
    1) All three have stripes.
    2) Only 1 has stripes.
    3) One is not striped.
    I am just...utterly stuck. I tried doing 4 CR 3/7 CR 4 for the first one, but that's apparently not correct..
    puzzled,

    You are very close.

    There are \binom{7}{3} ways to pick the three kittens, all of which are equally likely. Of these, there are \binom{4}{3} combinations which result in three striped. So the probability is ...
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  3. #3
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    4/35?
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  4. #4
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    Quote Originally Posted by puzzledwithpolynomials View Post
    4/35?
    Right!
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