Question 680956: dear tutors, pls help me with this problem:
A professor grading a statistics examination has promised to give an equal number of A's, B's, C's, and D's. If three students are chosen randomly, what is the probability that all three will receive different grades?
thank you
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! A professor grading a statistics examination has promised to give an equal number of A's, B's, C's, and D's. If three students are chosen randomly, what is the probability that all three will receive different grades?
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If there are 4 students:
The 1st choice can be any grade.
The 2nd is one of 3
The 3rd is one of 2
1/3 * 1/2 = 1/6
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