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Math Help - what is the probability that the next two cards selected will be....

  1. #1
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    what is the probability that the next two cards selected will be....

    ok lets try another probability problem....

    i have 3 cards, the first has a 3 on it, the second has a 5 on it and the third has a 9 on it.

    the question states that the 3 cards were taken from a box of 10 cards, each with a different integer on it from 1 to 10. what is the probability that the next two cards selected from the box will have both even integers on it?

    ok so there are 7 cards remaining, each with 1, 2,4, 6, 7, 8 and 10.

    so on our first try we get 5/7

    on our second try we get 4/6 or 2/3?

    so 5/7 times 2/3 =10/21

    is this right?
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  2. #2
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    e^(i*pi)'s Avatar
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    Re: what is the probability that the next two cards selected will be....

    Quote Originally Posted by slapmaxwell1 View Post
    ok lets try another probability problem....

    i have 3 cards, the first has a 3 on it, the second has a 5 on it and the third has a 9 on it.

    the question states that the 3 cards were taken from a box of 10 cards, each with a different integer on it from 1 to 10. what is the probability that the next two cards selected from the box will have both even integers on it?

    ok so there are 7 cards remaining, each with 1, 2,4, 6, 7, 8 and 10.

    so on our first try we get 5/7

    on our second try we get 4/6 or 2/3?

    so 5/7 times 2/3 =10/21

    is this right?
    Yes, that's right
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  3. #3
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    Re: what is the probability that the next two cards selected will be....

    Quote Originally Posted by e^(i*pi) View Post
    Yes, that's right
    ok so why is it necessary to multiply? im still not getting that part?
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  4. #4
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    Re: what is the probability that the next two cards selected will be....

    this problem was taken from Dr. Chung's SAT Math pg 52
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