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anonymous

  • one year ago

The table below shows the number of marbles of different colors in a bag: Ursula draws a marble from the bag randomly without looking. She then draws another marble from the bag without replacing the first one. Which expression shows the probability of drawing black marbles in both the trials?

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  1. anonymous
    • one year ago
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    A

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  2. anonymous
    • one year ago
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    B AND C

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  3. anonymous
    • one year ago
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    @welshfella @Vocaloid @vera_ewing @omgitsjc @LegendarySadist

  4. anonymous
    • one year ago
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    @Kash_TheSmartGuy

  5. anonymous
    • one year ago
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    Where is the table?

  6. anonymous
    • one year ago
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    here

  7. anonymous
    • one year ago
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  8. anonymous
    • one year ago
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    i was thinking the answer would be a but idk

  9. anonymous
    • one year ago
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    Are you sure that's the table? The question asks about black marbles, but the table you provided only talks about Red, blue, green, and purple.

  10. anonymous
    • one year ago
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    crap wrong table

  11. anonymous
    • one year ago
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  12. anonymous
    • one year ago
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    there but i was thinking (a) but im not sure

  13. anonymous
    • one year ago
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    When you look for a probability of one thing it's simply \[\large \sf \frac{Desired~object}{Total~objcets}\] Which in this case is \[\large \sf \frac{black~marbles}{Total~marbles}\] When you look for it to happen twice, you multiply the probabilities. Since we're assuming the first will end up with a loss of one black ( and one total ) the second probability would look like this \[\large \sf \frac{black~marbles-1}{Total~marbles-1}\] Now you would just multiply the probabilities together so \[\large \sf \frac{black~marbles}{Total~marbles}~\times ~ \large \sf \frac{black~marbles-1}{Total~marbles-1}\]

  14. anonymous
    • one year ago
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    would it be a thats what i got

  15. anonymous
    • one year ago
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    No, it's not a

  16. anonymous
    • one year ago
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    c

  17. anonymous
    • one year ago
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    or b idk

  18. anonymous
    • one year ago
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    Why not just plug the numbers into what I gave you?

  19. anonymous
    • one year ago
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    \[\large \sf \frac{black~marbles}{Total~marbles}~\times ~ \large \sf \frac{black~marbles-1}{Total~marbles-1}\]

  20. anonymous
    • one year ago
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    idkhowwwwwwwwwwwwwwwwwwwwwwwwwwwwww

  21. anonymous
    • one year ago
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    How many black marbles are there?

  22. anonymous
    • one year ago
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    10

  23. anonymous
    • one year ago
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    How many total marbles are there?

  24. anonymous
    • one year ago
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    16

  25. anonymous
    • one year ago
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    @LegendarySadist

  26. anonymous
    • one year ago
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    Now plug 10 in for black marbles and 16 for total marbles \[\large \sf \frac{black~marbles}{Total~marbles}~\times ~ \large \sf \frac{black~marbles-1}{Total~marbles-1}\]

  27. anonymous
    • one year ago
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    d

  28. anonymous
    • one year ago
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    You only showed A B and C as your options.

  29. anonymous
    • one year ago
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    soooooooo what is it @LegendarySadist

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