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anonymous

  • 5 years ago

each digit 0,1,2,3,4,5,6,7,8, an 9 is writting on a slip of paper and the slips are placed in a hat. if 3 slips of paper are selected at ramdom find the probl that the 3 numbers are greater then 5

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  1. anonymous
    • 5 years ago
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    3/10

  2. anonymous
    • 5 years ago
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    i mean 4/10

  3. anonymous
    • 5 years ago
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    No

  4. anonymous
    • 5 years ago
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    It's \[\frac{4 \choose 3}{10 \choose 3}\]

  5. anonymous
    • 5 years ago
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    there are ten choose 3 ways to choose three numbers out of ten ten choose 3 is 10*9*8/3/2=120 . This is your denominator. There are 4 choose 3 ways to choose the 4 of the ten numbers that are greater than 5. 4 choose 3 is 4. answer is 4/120 = 1/30

  6. anonymous
    • 5 years ago
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    Yeah, that's what I said ;p

  7. anonymous
    • 5 years ago
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    yup. couldn't find n choose k in the template.

  8. anonymous
    • 5 years ago
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    I always write equations manually. It's all just latex =) { n \choose k}

  9. anonymous
    • 5 years ago
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    much easier than using the editor

  10. anonymous
    • 5 years ago
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    thanks for the tip. {x\times y}\[\frac{a}{b}\] just testing

  11. anonymous
    • 5 years ago
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    oops didnt work

  12. anonymous
    • 5 years ago
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    You have to be sure your equation is inside the \[ \ ] bits (no space)

  13. anonymous
    • 5 years ago
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    \[x \times y\]

  14. anonymous
    • 5 years ago
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    \[\frac{a}{b}\]

  15. anonymous
    • 5 years ago
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    damn

  16. anonymous
    • 5 years ago
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    \[x\cdot y, \forall x \in N, f(g(x)) = (f\circ g)(x)\]

  17. anonymous
    • 5 years ago
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    Hrm? you are making fractions?

  18. anonymous
    • 5 years ago
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    trying to typed \[\frac{a}{b}\]

  19. anonymous
    • 5 years ago
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    it's working for me.. (I can see a over b)

  20. anonymous
    • 5 years ago
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    it looks good in preview but doesn't post right

  21. anonymous
    • 5 years ago
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    i see no fraction bar!

  22. anonymous
    • 5 years ago
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    \[x\times y\]

  23. anonymous
    • 5 years ago
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    got one

  24. anonymous
    • 5 years ago
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    \[{n \choose k}\]

  25. anonymous
    • 5 years ago
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    got it

  26. anonymous
    • 5 years ago
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    Sometimes the fraction bar doesn't show up for you when you post stuff. if you go to a different question and come back it can fix itself.

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