ProbabilityQ3
2009-11-10 10:50 pm
There are 40 students in a class, including students A and B. If 2 students are to be chisen at ramdom as class representatives,find the probability that both A and B are chosen.
回答 (1)
2009-11-10 11:12 pm
✔ 最佳答案
Choose 40 students have 40C2=780 possibilities. There are only 1 possibility that both A and B are chosen. So the probability is 1/780
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