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anonymous

  • 5 years ago

A bag of marbles contains 8 red marbles and 5 green marbles. Three marbles are drawn at random at the same time. Find the probability that all three are red.

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  1. anonymous
    • 5 years ago
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    8 out of 13

  2. anonymous
    • 5 years ago
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    \[{{8 \choose 3}\over {13 \choose 3}}\]

  3. anonymous
    • 5 years ago
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    I assume you're familiar with choose notation.

  4. anonymous
    • 5 years ago
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    Who me?

  5. anonymous
    • 5 years ago
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    Well either you, or the original poster. Whomever wants to read/understand my answer.

  6. anonymous
    • 5 years ago
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    it's not 8 out of 13 though. That'd be about 61 percent

  7. anonymous
    • 5 years ago
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    Well yours is eight thirds over thirteen thirds right?

  8. anonymous
    • 5 years ago
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    no. it's choose notation. \[{n \choose k} = {n! \over k!(n-k)!}\]

  9. anonymous
    • 5 years ago
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    Ok yepp then i have no clue lol

  10. anonymous
    • 5 years ago
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    that's ok. it's a fun thing to learn about.

  11. anonymous
    • 5 years ago
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    I'd rather stay away from the complicated stuff if you can do it the easy way i choose that.

  12. anonymous
    • 5 years ago
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    Basically it boils down to : How many different ways can we pick 3 red marbles from a set of 8 red marbles. Then we divide that by the number of different ways we can choose 3 marbles from a bag of 13 marbles.

  13. anonymous
    • 5 years ago
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    mhm.. I did that in like 4th grade so i really dont remember it lol

  14. anonymous
    • 5 years ago
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    I'm not sure it's the same as what you're remembering.. But in any case there are 56 different ways you can pick 3 red marbles from a set of 8 red marbles.

  15. anonymous
    • 5 years ago
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    And there are 286 ways you can pick any 3 marbles from a bag of 13 marbles.

  16. anonymous
    • 5 years ago
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    ugh huh..

  17. anonymous
    • 5 years ago
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    so 56/286 = .1958 or 19.6%

  18. anonymous
    • 5 years ago
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    Is the probability you will grab exactly 3 red marbles.

  19. anonymous
    • 5 years ago
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    I get it now, thank you.

  20. anonymous
    • 5 years ago
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    This function is often built into calculators as the C function

  21. anonymous
    • 5 years ago
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    Are you really smart brain wise or calculator wise or just incredibly smart period?

  22. anonymous
    • 5 years ago
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    hrm.. tough one to answer. Probably I have just taken a lot of math classes. ;)

  23. anonymous
    • 5 years ago
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    Oh mmk i see.

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