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anonymous

  • 5 years ago

There are 3 red, 1 blue, and 2 yellow marbles in a bag. Once a marble is selected, it is not replaced. Probability of red then blue

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  1. anonymous
    • 5 years ago
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    hmmm interesting, going to have to brush up on prob really quick

  2. anonymous
    • 5 years ago
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    ok no problem

  3. anonymous
    • 5 years ago
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    ok so this looks like the right track... but it's not exactly easy

  4. anonymous
    • 5 years ago
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    http://www.onlinemathlearning.com/probability-without-replacement.html

  5. anonymous
    • 5 years ago
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    so do you know the answer?

  6. anonymous
    • 5 years ago
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    I like need help badly!

  7. anonymous
    • 5 years ago
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    well, the red has to be selected first

  8. anonymous
    • 5 years ago
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    so the probability of that is 3/6 (1/2)

  9. anonymous
    • 5 years ago
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    now you need the next one to be blue

  10. anonymous
    • 5 years ago
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    bu there are less reds left - one less in fact

  11. anonymous
    • 5 years ago
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    so the probability of a blue at that point is 1/5

  12. anonymous
    • 5 years ago
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    so that means the total probability is 1/2 * 1/5 = 1/10

  13. anonymous
    • 5 years ago
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    so its 1/10?

  14. anonymous
    • 5 years ago
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    yep

  15. anonymous
    • 5 years ago
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    ok thnk you

  16. anonymous
    • 5 years ago
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    np =)

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