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March 25, 2017

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In a quiz program, 3 questions on sprots, 3 questions on general knowledge, and 4 questions on science are printed separately on 10 cards and placed upside down. John is asked to select 2 cards at random. What is the probability of Joohn selecting 2 questions on science?

  • Algebra 2 - ,

    Number of ways to select any two of the 10
    = C(10,2) = 45
    number of ways to select 2 out of the science
    = C(4,2) = 6
    prob of that event = 6/45 = 2/15

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