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6 September, 22:20

You have a rather strange die: Three faces are marked with the letter A, two faces with the letter B, and one face with the letter C. You roll the die until you get a B. What is the probability that a B does not appear during the first three rolls?

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  1. 6 September, 22:30
    0
    8/27 ≈ 29.6%

    Step-by-step explanation:

    Two of the six faces are B, which means four of the six faces are not B.

    The probability of rolling not B three times is:

    P = (4/6) ^3

    P = (2/3) ^3

    P = 8/27

    P ≈ 29.6%
  2. 6 September, 22:38
    0
    8/27 = 0.296 = 29.6%

    Step-by-step explanation:

    Given that the die faces are as follows:

    A A A B B C

    i. e:

    P (rolls A) = 3/6

    P (rolls B) = 2/6

    P (rolls C) = 1/6

    for any single roll,

    P (rolls not B) = P (rolls A) + P (rolls C)

    P (rolls not B) = 3/6 + 1/6 = 4/6 = 2/3

    for 3 consecutive rolls

    P (B does not appear) = P (rolls not B) * P (rolls not B) * P (rolls not B)

    = P (rolls not B) ³

    = (2/3) ³

    = 8/27 = 0.296 = 29.6%
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