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anonymous

  • one year ago

A bag contains 10 white balls and 15 black balls. Two balls are drawn in succession .what is probability that one of them is black and the other is white.

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  1. mathmate
    • one year ago
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    Given 10W 15B => total=25 Interpreting "drawn in succession" means no replacement. Assume balls are well mixed and selection is random. Need P(WB)+P(BW)=probability of drawing a black and a white, in any order. White drawn first. P(WB)=(10/25)*(15/24)=150/600=1/4 (25=original total, 24=no. of balls left after first draw). Go along the same lines for Black drawn first P(BW), and add together the two to get the final answer. Btw, this is a typical mathematics question, so please post in the math section in the future. You will probably get a faster response.

  2. anonymous
    • one year ago
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    Thanks a lot.☺️ but I posted it in math section and I don't get a reply so I post it in computer science.

  3. mathmate
    • one year ago
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    That's ok. What I would do is to first post in the appropriate section, and then as required, post in any other section with a link to the original question. This way, all responses are centralized in one place, even if there are 5 different posts for the same question.

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