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16 August, 14:56

A box contains 7 yellow, 5 blue, and 4 red balls. Three balls are drawn at random. Find the probability that:

Exactly two balls are yellow

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Answers (1)
  1. 16 August, 16:31
    0
    Answer: 27/80

    Step-by-step explanation:

    Your dealing with probability this time, not multiplying chooses. So it's adding instead of multiplying.

    Total balls, 16

    All options: 16 choose 3,

    Blue

    7 choose 2 * 5 choose 1 / 16 choose 3 = option1

    Red

    7 choose 2 * 5 choose 1 / 16 choose 3 = option2

    Add option1 + 2
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