Mr minus picks 2 students at random from his class of 31 students.15 of his students are boys. What is the probability he picks 2 girls from the class?

Many thanks.

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  1. so there are 15 boys and 16 girls

    prob(that both picked are girls)
    = C(16,2) / C(31,2) = 120/465 = 8/31


    prob(girl, girl)
    = (16/31)(15/30)
    = (16/31)(1/2) = 8/31

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