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Difficult Math Problem #78 - Probability

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800guy Master | Next Rank: 500 Posts Default Avatar
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Difficult Math Problem #78 - Probability

Post Wed Dec 20, 2006 8:51 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    A rental car service facility has 10 foreign cars and 15 domestic cars waiting to be serviced on a particular Saturday morning. Because there are so few mechanics, only 6 can be serviced.

    (a) If the 6 cars are chosen at random, what is the probability that 3 of the cars selected
    are domestic and the other 3 are foreign?
    (b) If the 6 cars are chosen at random, what is the probability that at most one domestic
    car is selected?

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    800guy Master | Next Rank: 500 Posts Default Avatar
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    Post Sun Dec 31, 2006 12:26 pm
    OA coming when a few people reply

    maxim730 Senior | Next Rank: 100 Posts Default Avatar
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    Post Tue Jan 02, 2007 11:11 am
    A) (10C3*15C3) / (25C6)

    B) (15C6)/ (25C6)

    Shrug..Sad

    800guy Master | Next Rank: 500 Posts Default Avatar
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    Post Wed Jan 03, 2007 11:53 am
    OA

    A) 10C3*15C3/25C6
    B) Probability of no domestic car + Probability of 1 domestic car =
    10C6/25C6 + 15C1 *10C5/25C6

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