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27 April, 13:31

There are 6 boys and 6 girls in a room. what is the probabilitythat the two children chosen at random will be one girl and one boy?

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  1. 27 April, 13:37
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    P (first is a boy) = 6/12 = 1/2

    P (second is a girl) = 6/11

    P (first boy then a girl) = 1/2 * 6/11 = 6/22 = 3/11

    by a similar process P (girl then a boy) = 3/11

    So the required probability = 3/11 + 3/11 = 6/11 Answer
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