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Math Help - Four Coins in Jar

  1. #1
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    Four Coins in Jar

    There are four coins in a jar: a penny, a nickel, a dime, and a quarter. One coin is removed at random. Without replacing the first coin, a second
    coin is removed.


    Find the probability that the total value of the two coins selected is
    (1) 11 cents
    (2) greater than 35 cents
    (3) at most 30 cents
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  2. #2
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    Draw a tree diagram for the problem listed above and you will be able to solve the problem fairly easily.
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  3. #3
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    ok....

    Quote Originally Posted by tester85 View Post
    Draw a tree diagram for the problem listed above and you will be able to solve the problem fairly easily.
    Is there another method that can be used?
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  4. #4
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    Yes. You solve the problem using conditional probability as the the experiment performed only involve 2 stages.

    More on conditional probablity, you can refer to the link below

    7. Conditional Probability

    Conditional probability - Wikipedia, the free encyclopedia

    But i will strongly advice you to draw the tree diagram.
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  5. #5
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    ok...

    Quote Originally Posted by tester85 View Post
    Yes. You solve the problem using conditional probability as the the experiment performed only involve 2 stages.

    More on conditional probablity, you can refer to the link below

    7. Conditional Probability

    Conditional probability - Wikipedia, the free encyclopedia

    But i will strongly advice you to draw the tree diagram.
    I knew it. Thanks
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