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A={2,3,4,5}
B={4,5,6,7,8}
Two integers will be randomly selected from the sets above, one integer from set A and one integer from set B. What is the probability that the sum of the two integers will equal 9?
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分析B选项
分析C选项
分析D选项
分析E选项
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A组中无论哪一个数都可以在B组中找到一个对应的，满足条件的数，所以概率就是1/5
vivi54
A组和B组组合有1/4*1/5=1/20种可能，而其中=9的有五种，所以为5/20
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2019-07-17 17:10:27
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