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math

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Two representatives are chosen at random from a group of 100 students that has 50 girls and 50 boys. What is the probability that the representatives seledted are either both boys or both girls?

  • math -

    numbers of groups of twos from 50 = C(50,2) = 1225
    number of possible groups of twos from 100 = 4950

    prob = 2(1225)/4950 = 49/99

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