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Math Help - probability of answering 2 different sections questions

  1. #1
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    probability of answering 2 different sections questions

    A student is answering a paper in which he can choose 4 question out of 6 to answer. If the paper is divided into 2 sections, A , and B, each with 3 question. The candidate must choose two question form each section, how many ways can this be done?

    my working is 3C2 X 3C2= 36 which means i choose 2 out of 3 question from A, and at the same time, i also 2 out of 3 question from B

    why cant i do in this way? the ans given is 9 .
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  2. #2
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    Re: probability of answering 2 different sections questions

    Last time I checked, 3C2 = 3, so 3x3 = 9...
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    Re: probability of answering 2 different sections questions

    Quote Originally Posted by Prove It View Post
    Last time I checked, 3C2 = 3, so 3x3 = 9...
    sorry, i entered in my calc as 3p2
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    Re: probability of answering 2 different sections questions

    Moral: a calculator is not a substitute for thinking!
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