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anonymous

  • one year ago

What did I do wrong? (Probability) A bag of marbles has 12 red, 7 yellow, 5 blue and 1 white. Find the probability of selecting 4 marbles from the bag where all 4 are red. A. 1/64 B. 9/230 C. 1/4 D. 1/7590 ___ I got 1/12650 which isn't even an option. I did this my multiplying 1/25*2/25*3*25*4/25. Which is not an option. And then 12/390625 by multiplying 4/25*3/24*2/22*1/21 which is also not an option.

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  1. Vocaloid
    • one year ago
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    there are 12 red marbles, so if we assume there is no replacement it would be (12/25)*(11/25)*(10/25)*(9/25) if we assume replacement, it would simply be (12/25)^4

  2. anonymous
    • one year ago
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    Oh wow.. I put the 4 in place of 12 as the starting point.. Thanks @Vocaloid

  3. Vocaloid
    • one year ago
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    ahh, small correction to my formula (12/25)*(11/24)*(10/23)*(9/22)

  4. Vocaloid
    • one year ago
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    but yea, you're on the right track now :)

  5. anonymous
    • one year ago
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    Thanks :)

  6. anonymous
    • one year ago
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    It's B. Thanks!

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