400-1816-180
本題由lindy提供
A certain junior class has 1,000 students and a certain
A.3/40000
B.1/3600
C.9/2000
D.1/60
E.1/15
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答案：
A
總共六十對(duì)
sibling pair 所以分子就是60，因?yàn)槿〕鰜砬『檬莝ibling pair就60種可能，分子就是隨便挑 1000*800 
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