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Hogwarts has 4 houses (Gryffindor, Hufflepuff, Ravenclaw, Slytherin). We can represent them by their first letters...

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Hogwarts has 4 houses (Gryffindor, Hufflepuff, Ravenclaw,Slytherin). We can represent them by their first letters G H R S.Each house has exactly 20 students. If I choose 4 studentsrandomly, what is the probability that I have one from eachhouse?

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