国际顶尖MBA申请交流平台--TOPWAY MBA

217. A certain junior class has 1,000 students and a certain senior class has 800 students. Among these students, there are 60 sibling pairs, each consisting of 1 junior an 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?

(A) 3/40,000

(B) 1/3,600

(C) 9/2,000

(D) 1/60

(E) 1/15

Choose A

Question: 这个题目的思路应该是怎样的？

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